Remove dependency on PHP's ext/calendar extension, and use our own

13 files changed, 2965 insertions, 0 deletions

diff --git a/library/fisharebest/ext-calendar/CHANGELOG.md b/library/fisharebest/ext-calendar/CHANGELOG.md
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+++ b/library/fisharebest/ext-calendar/CHANGELOG.md
@@ -0,0 +1,20 @@
+CHANGE LOG
+==========
+
+## 1.1.0 (2014-09-13)
+ - Add support for Arabic (Hijri) and Persian (Jalali) calendars.
+ - Convert logic to lookup tables for better performance.
+
+## 1.0.3 (2014-09-12)
+ - Simplify the way shims are created.
+
+## 1.0.2 (2014-09-11)
+ - Wrong encoding of Hebrew dates.
+ - Emulate PHP bug 54254 in Hebrew dates.
+
+## 1.0.1 (2014-09-11)
+ - Improve coverage of unit tests.
+ - Convert logic to lookup tables for better performance.
+
+## 1.0.0 (2014-09-10)
+ - Initial release, with support for all the functions and constants from `ext/calendar`.
diff --git a/library/fisharebest/ext-calendar/LICENSE.md b/library/fisharebest/ext-calendar/LICENSE.md
new file mode 100644
index 0000000000..9662fa46e1
--- /dev/null
+++ b/library/fisharebest/ext-calendar/LICENSE.md
@@ -0,0 +1,677 @@
+GNU GENERAL PUBLIC LICENSE
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+Program specifies that a certain numbered version of the GNU General
+Public License “or any later version” applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy’s
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+###  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+###  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+###  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+## How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the “copyright” line and a pointer to where the full notice is found.
+
+    <one line to give the program’s name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program’s commands
+might be different; for a GUI interface, you would use an “about box”.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a “copyright disclaimer” for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+&lt;<http://www.gnu.org/licenses/>&gt;.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+&lt;<http://www.gnu.org/philosophy/why-not-lgpl.html>&gt;.
diff --git a/library/fisharebest/ext-calendar/README.md b/library/fisharebest/ext-calendar/README.md
new file mode 100644
index 0000000000..1f8225fb21
--- /dev/null
+++ b/library/fisharebest/ext-calendar/README.md
@@ -0,0 +1,138 @@
+[![Build Status](https://travis-ci.org/fisharebest/ext-calendar.svg?branch=master)](https://travis-ci.org/fisharebest/ext-calendar)
+[![Coverage Status](https://coveralls.io/repos/fisharebest/ext-calendar/badge.png)](https://coveralls.io/r/fisharebest/ext-calendar)
+[![SensioLabsInsight](https://insight.sensiolabs.com/projects/952d6e11-6941-447b-9757-fc8dbc3d2a1f/mini.png)](https://insight.sensiolabs.com/projects/952d6e11-6941-447b-9757-fc8dbc3d2a1f)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/fisharebest/ext-calendar/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/fisharebest/ext-calendar/?branch=master)
+[![Code Climate](https://codeclimate.com/github/fisharebest/ext-calendar/badges/gpa.svg)](https://codeclimate.com/github/fisharebest/ext-calendar)
+
+PHP calendar functions
+======================
+
+This package provides an implementation of the
+[Arabic (Hijri)](https://en.wikipedia.org/wiki/Islamic_calendar),
+[French Republican](https://en.wikipedia.org/wiki/French_Republican_Calendar),
+[Gregorian](https://en.wikipedia.org/wiki/Gregorian_calendar),
+[Julian](https://en.wikipedia.org/wiki/Julian_calendar),
+[Jewish](https://en.wikipedia.org/wiki/Hebrew_calendar) and
+[Persian(Jalali)](https://en.wikipedia.org/wiki/Iranian_calendars) calendars, plus
+[shims](https://en.wikipedia.org/wiki/Shim_%28computing%29) for the
+[functions](https://php.net/ref.calendar) and [constants](https://php.net/calendar.constants)
+in PHP‘s [ext/calendar](https://php.net/calendar) extension.
+It allows you to use these functions on servers that do not have the extension installed.
+
+* [cal_days_in_month()](https://php.net/cal_days_in_month)
+* [cal_from_jd()](https://php.net/cal_from_jd)
+* [cal_info()](https://php.net/cal_info)
+* [cal_to_jd()](https://php.net/cal_to_jd)
+* [easter_date()](https://php.net/easter_date)
+* [easter_days()](https://php.net/easter_days)
+* [FrenchToJD()](https://php.net/FrenchToJD)
+* [GregorianToJD()](https://php.net/GregorianToJD)
+* [JDDayOfWeek()](https://php.net/JDDayOfWeek)
+* [JDMonthName()](https://php.net/JDMonthName)
+* [JDToFrench()](https://php.net/JDToFrench)
+* [JDToGregorian()](https://php.net/JDToGregorian)
+* [jdtojewish()](https://php.net/jdtojewish)
+* [JDToJulian()](https://php.net/JDToJulian)
+* [jdtounix()](https://php.net/jdtounix)
+* [JewishToJD()](https://php.net/JewishToJD)
+* [JulianToJD()](https://php.net/JulianToJD)
+* [unixtojd()](https://php.net/unixtojd)
+
+How to use it
+=============
+
+Add the package as a dependency in your `composer.json` file:
+
+``` javascript
+require {
+    "fisharebest/ext-calendar": "1.*"
+}
+```
+
+If you want to create the “shim” functions, you must tell the package to create them.
+
+```php
+// Put this in your bootstrap.php or similar.
+\Fisharebest\ExtCalendar\Shim::create();
+```
+
+Now you can use the PHP functions, whether the ext/calendar is installed or not:
+
+``` php
+print_r(cal_info(CAL_GREGORIAN));
+```
+
+Alternatively, just use the calendar classes directly.
+
+``` php
+use Fisharebest\ExtCalendar;
+
+// Create a calendar
+$calendar = new ArabicCalendar;
+$calendar = new FrenchCalendar;
+$calendar = new GregorianCalendar;
+$calendar = new JewishCalendar;
+$calendar = new JulianCalendar;
+$calendar = new PersianCalendar;
+
+// Date conversions
+$julian_day = $calendar->ymdToJd($year, $month, $day);
+list($year, $month, $day) = $calendar->jdToYmd($julian_day);
+
+// Information functions (see the source for more)
+$is_leap_year = $calendar->leapYear($year);
+$day_of_week = $calendar->dayOfWeek($julian_day);
+$month_length = $calendar->daysInMonth($year, $month);
+```
+
+Known restrictions and limitations
+==================================
+
+When faced with invalid inputs, the shim functions trigger `E_USER_WARNING` instead of `E_WARNING`.  The text of the error messages is the same.
+
+The functions `easterdate()` and `jdtounixtime()` use PHP‘s timezone, instead of the operating system‘s timezone.  These may be different.
+
+Compatibility with different versions of PHP
+============================================
+
+The following PHP bugs are emulated, according to the version of PHP being used.
+Thus the package always provides the same behaviour as the native `ext/calendar` extension.
+
+* [#54254](https://bugs.php.net/bug.php?id=54254) Jewish month "Adar" - fixed in PHP 5.5
+
+* [#67960](https://bugs.php.net/bug.php?id=67960) Constants `CAL_DOW_SHORT` and `CAL_DOW_LONG` - found/fixed by this project!
+
+* [#67976](https://bugs.php.net/bug.php?id=67976) Wrong value in `cal_days_in_month()` for French calendar - found by this project!
+
+HHVM
+====
+
+The package should work on [HHVM](http://hhvm.com/).  However, we can’t run the unit
+tests on it, as HHVM does not (yet?) include the `ext/calendar` extension.
+
+Development and contributions
+=============================
+
+Note that `require-dev` will require `ext-calendar`, as we use it as a reference
+implementation for testing.
+
+Due to the known restrictions above, you may need to run unit tests using `TZ=UTC phpunit`.
+
+Pull requests are welcome.  Please ensure you include unit-tests where
+applicable, and follow the existing coding conventions.  These are to follow
+[PSR](http://www.php-fig.org/) standards, except for:
+
+* tabs are used for indentation
+* opening braces always go on the end of the previous line
+
+History
+=======
+
+These functions were originally written for the [webtrees](http://www.webtrees.net)
+project.  As part of a refactoring process, they were extracted to a standalone
+library, given version numbers, unit tests, etc.
+
+Future plans
+============
+
+It is hoped to extend the French calendar to allow it to be used for modern times.
diff --git a/library/fisharebest/ext-calendar/src/ArabicCalendar.php b/library/fisharebest/ext-calendar/src/ArabicCalendar.php
new file mode 100644
index 0000000000..55c045d36a
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/ArabicCalendar.php
@@ -0,0 +1,116 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class ArabicCalendar - calculations for the Arabic (Hijri) calendar.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class ArabicCalendar extends Calendar implements CalendarInterface {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Arabic';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 4; // PHP uses 0-3
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_ARABIC';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DHIJRI@';
+
+	/** The earliest Julian Day number that can be converted into this calendar. */
+	const JD_START = 1948440; // 1 Muharram 1 AH = 16 JUL 0622 (Julian)
+
+	/** The maximum number of days in any month */
+	const MAX_DAYS_IN_MONTH = 30;
+
+	/**
+	 * Month lengths for regular years and leap-years.
+	 *
+	 * @var int[][]
+	 */
+	protected static $DAYS_IN_MONTH = array(
+		0 => array(1 => 30, 28, 30, 29, 30, 29, 30, 29, 30, 29, 30, 29),
+		1 => array(1 => 30, 28, 30, 29, 30, 29, 30, 29, 30, 29, 30, 30),
+	);
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		return ((11 * $year + 14) % 30) < 11;
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		$year = (int)((30 * ($jd - 1948439) + 10646) / 10631);
+		$month = (int)((11 * ($jd - $year * 354 - (int)((3 + 11 * $year) / 30) - 1948085) + 330) / 325);
+		$day = $jd - 29 * ($month - 1) - (int)((6 * $month - 1) / 11) - $year * 354 - (int)((3 + 11 * $year) / 30) - 1948084;
+
+		return array($year, $month, $day);
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		return $day + 29 * ($month - 1) + (int)((6 * $month - 1) / 11) + $year * 354 + (int)((3 + 11 * $year) / 30) + 1948084;
+	}
+
+	/**
+	 * Month names for the calendar.
+	 *
+	 * @return string[]
+	 */
+	public function monthNames() {
+		return array(
+			1 => 'Muharram', 'Safar', 'Rabi‘ I', 'Rabi‘ II', 'Jumada I', 'Jumada II',
+			'Rajab', 'Sha‘aban', 'Ramadan', 'Shawwal', 'Dhu al-Qi‘dah', 'Dhu al-Hijjah',
+		);
+	}
+
+	/**
+	 * Calculate the number of days in a month.
+	 *
+	 * @param  int $year
+	 * @param  int $month
+	 *
+	 * @return int
+	 */
+	public function daysInMonth($year, $month) {
+		if ($year == 0 || $month < 1 || $month > self::MAX_MONTHS_IN_YEAR) {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		} else {
+			return static::$DAYS_IN_MONTH[$this->leapYear($year)][$month];
+		}
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/Calendar.php b/library/fisharebest/ext-calendar/src/Calendar.php
new file mode 100644
index 0000000000..2f48e8b581
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/Calendar.php
@@ -0,0 +1,225 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class Calendar - generic base class for specific calendars.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+abstract class Calendar {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Undefined';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = -1;
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_UNDEFINED';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DUNKNOWN@';
+
+	/** The earliest Julian Day number that can be converted into this calendar. */
+	const JD_START = 1;
+
+	/** The latest Julian Day number that can be converted into this calendar. */
+	const JD_END = 2147483647;
+
+	/** The maximum number of months in any year */
+	const MAX_MONTHS_IN_YEAR = 12;
+
+	/** The maximum number of days in any month */
+	const MAX_DAYS_IN_MONTH = 31;
+
+	/**
+	 * The concrete class needs to provide the implementation.
+	 *
+	 * @return string[]
+	 */
+	protected abstract function monthNames();
+
+	/**
+	 * English names for the days of the week.
+	 *
+	 * @return string[]
+	 */
+	protected function dayNames() {
+		return array(
+			'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday',
+		);
+	}
+
+	/**
+	 * Abbreviated English names for the days of the week.
+	 *
+	 * @return string[]
+	 */
+	protected function dayNamesAbbreviated() {
+		return array(
+			'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat',
+		);
+	}
+
+	/**
+	 * The concrete class needs to provide the implementation.
+	 *
+	 * @param $jd
+	 */
+	public abstract function jdToYmd($jd);
+
+	/**
+	 * The concrete class needs to provide the implementation.
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public abstract function ymdToJd($year, $month, $day);
+
+	/**
+	 * Convert a Julian Day number into a calendar date.
+	 *
+	 * @param  $jd
+	 * @return int[] Array of month, day and year
+	 */
+	public function calFromJd($jd) {
+		$dow = $this->dayOfWeek($jd);
+
+		if ($jd >= static::JD_START && $jd <= static::JD_END) {
+			list($year, $month, $day) = $this->jdToYmd($jd);
+
+			return array(
+				'date' => $month . '/' . $day . '/' . $year,
+				'month' => $month,
+				'day' => $day,
+				'year' => $year,
+				'dow' => $dow,
+				'abbrevdayname' => $this->dayNameAbbreviated($dow),
+				'dayname' => $this->dayName($dow),
+				'abbrevmonth' => $this->jdMonthNameAbbreviated($jd),
+				'monthname' => $this->jdMonthName($jd),
+			);
+		} else {
+			return array(
+				'date' => '0/0/0',
+				'month' => 0,
+				'day' => 0,
+				'year' => 0,
+				'dow' => $dow,
+				'abbrevdayname' => $this->dayNameAbbreviated($dow),
+				'dayname' => $this->dayName($dow),
+				'abbrevmonth' => '',
+				'monthname' => '',
+			);
+		}
+	}
+
+	/**
+	 * Provide information about this calendar.
+	 *
+	 * @return array
+	 */
+	public function phpCalInfo() {
+		return array(
+			'months' => $this->monthNames(),
+			'abbrevmonths' => $this->monthNamesAbbreviated(),
+			'maxdaysinmonth' => static::MAX_DAYS_IN_MONTH,
+			'calname' => static::PHP_CALENDAR_NAME,
+			'calsymbol' => static::PHP_CALENDAR_SYMBOL,
+		);
+	}
+
+	/**
+	 * Calculate the day of the week for a given Julian Day number.
+	 *
+	 * @param int $jd
+	 *
+	 * @return int 0=Sunday ... 6=Saturday
+	 */
+	public function dayOfWeek($jd) {
+		$dow = ($jd + 1) % 7;
+		if ($dow < 0) {
+			return $dow + 7;
+		} else {
+			return $dow;
+		}
+	}
+
+	/**
+	 * English name for a day of the week.
+	 *
+	 * @param int $dow Day of the week
+	 *
+	 * @return string
+	 */
+	public function dayName($dow) {
+		$days = $this->dayNames();
+
+		return $days[$dow];
+	}
+
+	/**
+	 * Abbreviated English name for a day of the week.
+	 *
+	 * @param int $dow Day of the week
+	 *
+	 * @return string
+	 */
+	public function dayNameAbbreviated($dow) {
+		$days = $this->dayNamesAbbreviated();
+
+		return $days[$dow];
+	}
+
+	/**
+	 * Calculate the name of a month, for a specified Julian Day number.
+	 *
+	 * @param  $jd
+	 *
+	 * @return string
+	 */
+	public function jdMonthName($jd) {
+		list(, $month) = $this->jdToYmd($jd);
+		$months = $this->monthNames();
+
+		return $months[$month];
+	}
+
+	/**
+	 * Calculate the name of a month, for a specified Julian Day number.
+	 *
+	 * @param  int $jd
+	 *
+	 * @return string
+	 */
+	public function jdMonthNameAbbreviated($jd) {
+		list(, $month) = $this->jdToYmd($jd);
+		$months = $this->monthNamesAbbreviated();
+
+		return $months[$month];
+	}
+
+	/**
+	 * Unless otherwise defined, abbreviated month names are the same as full names.
+	 *
+	 * @return string[]
+	 */
+	public function monthNamesAbbreviated() {
+		return $this->monthNames();
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/CalendarInterface.php b/library/fisharebest/ext-calendar/src/CalendarInterface.php
new file mode 100644
index 0000000000..3373b03fac
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/CalendarInterface.php
@@ -0,0 +1,29 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * interface CalendarInterface - each calendar implementation needs to provide
+ * these methods.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+interface CalendarInterface {
+	public function daysInMonth($year, $month);
+	public function dayOfWeek($jd);
+	public function jdToYmd($jd);
+	public function leapYear($year);
+	public function ymdToJd($year, $month, $day);
+}
diff --git a/library/fisharebest/ext-calendar/src/FrenchCalendar.php b/library/fisharebest/ext-calendar/src/FrenchCalendar.php
new file mode 100644
index 0000000000..2f30a192ea
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/FrenchCalendar.php
@@ -0,0 +1,120 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class FrenchCalendar - calculations for the French Republican calendar.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class FrenchCalendar extends Calendar implements CalendarInterface {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'French';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 3;
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_FRENCH';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DFRENCH R@';
+
+	/** The earliest Julian Day number that can be converted into this calendar. */
+	const JD_START = 2375840;
+
+	/** The latest Julian Day number that can be converted into this calendar. */
+	const JD_END = 2380952; // For compatibility with PHP, this is 0014-13-05
+
+	/** The maximum number of months in any year */
+	const MAX_MONTHS_IN_YEAR = 13;
+
+	/** The maximum number of days in any month */
+	const MAX_DAYS_IN_MONTH = 30;
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		return $year % 4 == 3;
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		$year = (int)(($jd - 2375109) * 4 / 1461) - 1;
+		$month = (int)(($jd - 2375475 - $year * 365 - (int)($year / 4)) / 30) + 1;
+		$day = $jd - 2375444 - $month * 30 - $year * 365 - (int)($year / 4);
+
+		return array($year, $month, $day);
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		return 2375444 + $day + $month * 30 + $year * 365 + (int)($year / 4);
+	}
+
+	/**
+	 * Month names for the calendar.
+	 *
+	 * @return string[]
+	 */
+	public function monthNames() {
+		return array(
+			1 => 'Vendemiaire', 'Brumaire', 'Frimaire', 'Nivose', 'Pluviose', 'Ventose',
+			'Germinal', 'Floreal', 'Prairial', 'Messidor', 'Thermidor', 'Fructidor', 'Extra',
+		);
+	}
+
+	/**
+	 * Calculate the number of days in a month.
+	 *
+	 * @param  int $year
+	 * @param  int $month
+	 *
+	 * @return int
+	 */
+	public function daysInMonth($year, $month) {
+		if ($year < 1 || $year > 14) {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		} elseif ($month >=1 && $month <= 12) {
+			return 30;
+		} elseif ($month == 13) {
+			if ($this->leapYear($year)) {
+				return 6;
+			} else {
+				return $year == 14 ? -2380948 : 5; // Emulate a bug in PHP
+			}
+		} else {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		}
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/GregorianCalendar.php b/library/fisharebest/ext-calendar/src/GregorianCalendar.php
new file mode 100644
index 0000000000..2856a4210a
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/GregorianCalendar.php
@@ -0,0 +1,137 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class GregorianCalendar - calculations for the (proleptic) Gregorian calendar.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class GregorianCalendar extends JulianCalendar implements CalendarInterface {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Gregorian';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 0;
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_GREGORIAN';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DGREGORIAN@';
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		if ($year < 0) {
+			$year++;
+		}
+
+		return $year % 4 == 0 && $year % 100 != 0 || $year % 400 == 0;
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		$a = $jd + 32044;
+		$b = (int)((4 * $a + 3) / 146097);
+		$c = $a - (int)($b * 146097 / 4);
+		$d = (int)((4 * $c + 3) / 1461);
+		$e = $c - (int)((1461 * $d) / 4);
+		$m = (int)((5 * $e + 2) / 153);
+		$day = $e - (int)((153 * $m + 2) / 5) + 1;
+		$month = $m + 3 - 12 * (int)($m / 10);
+		$year = $b * 100 + $d - 4800 + (int)($m / 10);
+		if ($year < 1) { // 0=1BC, -1=2BC, etc.
+			$year--;
+		}
+
+		return array($year, $month, $day);
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		if ($year < 0) {
+			// 1 B.C.E. => 0, 2 B.C.E> => 1, etc.
+			++$year;
+		}
+		$a = (int)((14 - $month) / 12);
+		$year = $year + 4800 - $a;
+		$month = $month + 12 * $a - 3;
+
+		return $day + (int)((153 * $month + 2) / 5) + 365 * $year + (int)($year / 4) - (int)($year / 100) + (int)($year / 400) - 32045;
+	}
+
+	/**
+	 * Get the number of days after March 21 that easter falls, for a given year.
+	 *
+	 * Uses the algorithm found in PHP’s ext/calendar/easter.c
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public function easterDays($year) {
+		// The “golden” number
+		$golden = $year % 19 + 1;
+
+		// The “dominical” number (finding a Sunday)
+		$dom = ($year + (int)($year / 4) - (int)($year / 100) + (int)($year / 400)) % 7;
+		if ($dom < 0) {
+			$dom += 7;
+		}
+
+		// The solar correction
+		$solar = (int)(($year - 1600) / 100) - (int)(($year - 1600) / 400);
+
+		// The lunar correction
+		$lunar = (int)((int)(($year-1400) / 100) * 8) / 25;
+
+		// The uncorrected “Paschal full moon” date
+		$pfm = (3 - 11 * $golden + $solar - $lunar) % 30;
+		if ($pfm < 0) {
+			$pfm += 30;
+		}
+
+		// The corrected “Paschal full moon” date
+		if ($pfm == 29 || $pfm == 28 && $golden > 11) {
+			$pfm--;
+		}
+
+		$tmp = (4 - $pfm - $dom) % 7;
+		if ($tmp < 0) {
+			$tmp += 7;
+		}
+
+		return $pfm + $tmp + 1;
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/JewishCalendar.php b/library/fisharebest/ext-calendar/src/JewishCalendar.php
new file mode 100644
index 0000000000..038188fcd0
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/JewishCalendar.php
@@ -0,0 +1,491 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class JewishCalendar - calculations for the Jewish calendar.
+ *
+ * Hebrew characters in this file have UTF-8 encoding.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class JewishCalendar extends Calendar implements CalendarInterface{
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Jewish';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 2;
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_JEWISH';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DHEBREW@';
+
+	/** The earliest Julian Day number that can be converted into this calendar. */
+	const JD_START = 347998; // 1 Tishri 0001 AM
+
+	/** The latest Julian Day number that can be converted into this calendar. */
+	const JD_END = 324542846;
+
+	/** The maximum number of days in any month. */
+	const MAX_DAYS_IN_MONTH = 30;
+
+	/** The maximum number of months in any year. */
+	const MAX_MONTHS_IN_YEAR = 13;
+
+	/** Place this symbol before the final letter of a sequence of numerals. */
+	const GERSHAYIM = '״';
+
+	/** Place this symbol after a single numeral. */
+	const GERESH = '׳';
+
+	/** Word for thousand. */
+	const ALAFIM = 'אלפים';
+
+	/** A year that is one day shorter than normal. */
+	const DEFECTIVE_YEAR  = -1;
+
+	/** A year that has the normal number of days. */
+	const REGULAR_YEAR  = 0;
+
+	/** A year that is one day longer than normal. */
+	const COMPLETE_YEAR  = 1;
+
+	/**
+	 * Hebrew numbers are represented by letters, similar to roman numerals.
+	 *
+	 * @var string[]
+	 */
+	private static $HEBREW_NUMERALS = array(
+		9000 => 'ט',
+		8000 => 'ח',
+		7000 => 'ז',
+		6000 => 'ו',
+		5000 => 'ה',
+		4000 => 'ד',
+		3000 => 'ג',
+		2000 => 'ב',
+		1000 => 'א',
+		400 => 'ת',
+		300 => 'ש',
+		200 => 'ר',
+		100 => 'ק',
+		90 => 'צ',
+		80 => 'פ',
+		70 => 'ע',
+		60 => 'ס',
+		50 => 'נ',
+		40 => 'מ',
+		30 => 'ל',
+		20 => 'כ',
+		19 => 'יט',
+		18 => 'יח',
+		17 => 'יז',
+		16 => 'טז',
+		15 => 'טו',
+		10 => 'י',
+		9 => 'ט',
+		8 => 'ח',
+		7 => 'ז',
+		6 => 'ו',
+		5 => 'ה',
+		4 => 'ד',
+		3 => 'ג',
+		2 => 'ב',
+		1 => 'א',
+	);
+
+	/**
+	 * Some numerals take a different form when they appear at the end of a number.
+	 *
+	 * @var string[]
+	 */
+	private static $HEBREW_NUMERALS_FINAL = array(
+		90 => 'צ',
+		80 => 'פ',
+		70 => 'ע',
+		60 => 'ס',
+		50 => 'נ',
+		40 => 'מ',
+		30 => 'ל',
+		20 => 'כ',
+		10 => 'י',
+	);
+
+	/**
+	 * These months have fixed lengths.  Others are variable.
+	 *
+	 * @var int[]
+	 */
+	private static $FIXED_MONTH_LENGTHS = array(
+		1 => 30, 4 => 29, 5 => 30, 7 => 29, 8 => 30, 9 => 29, 10 => 30, 11 => 29, 12 => 30, 13 => 29
+	);
+
+	/**
+	 * Cumulative number of days for each month in each type of year.
+	 * First index is false/true (non-leap year, leap year)
+	 * Second index is year type (-1, 0, 1)
+	 * Third index is month number (1 ... 13)
+	 *
+	 * @var int[][][]
+	 */
+	private static $CUMULATIVE_DAYS = array(
+		0 => array( // Non-leap years
+			-1 => array( // Deficient years
+				1 => 0, 30, 59, 88, 117, 147, 147, 176, 206, 235, 265, 294, 324
+			),
+			0 =>  array( // Regular years
+				1 => 0, 30, 59, 89, 118, 148, 148, 177, 207, 236, 266, 295, 325
+			),
+			1 => array( // Complete years
+				1 => 0, 30, 60, 90, 119, 149, 149, 178, 208, 237, 267, 296, 326
+			),
+		),
+		1 => array( // Leap years
+			-1 => array( // Deficient years
+				1 => 0, 30, 59, 88, 117, 147, 177, 206, 236, 265, 295, 324, 354
+			),
+			0 =>  array( // Regular years
+				1 => 0, 30, 59, 89, 118, 148, 178, 207, 237, 266, 296, 325, 355
+			),
+			1 => array( // Complete years
+				1 => 0, 30, 60, 90, 119, 149, 179, 208, 238, 267, 297, 326, 356
+			),
+		),
+	);
+
+
+	/**
+	 * Rosh Hashanah cannot fall on a Sunday, Wednesday or Friday.  Move the year start accordingly.
+	 *
+	 * @var int[]
+	 */
+	private static $ROSH_HASHANAH = array(347998, 347997, 347997, 347998, 347997, 347998, 347997);
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		return (7 * $year + 1) % 19 < 7;
+	}
+
+	/**
+	 * Convert a Julian day number into a year.
+	 *
+	 * @param int $jd
+	 *
+	 * @return int;
+	 */
+	protected function jdToY($jd) {
+		// Generate an approximate year - may be out by one either way.  Add one to it.
+		$year = (int)(($jd - 347998) / 365) + 1;
+
+		// Adjust by subtracting years;
+		while ($this->yToJd($year) > $jd) {
+			$year--;
+		}
+
+		return $year;
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param int $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		// Find the year
+		$year = $this->jdToY($jd);
+
+		// Add one month at a time, to use up the remaining days.
+		$month = 1;
+		$day = $jd - $this->yToJd($year) + 1;
+
+		while ($day > $this->daysInMonth($year, $month)) {
+			$day -= $this->daysInMonth($year, $month);
+			$month += 1;
+		}
+
+		// PHP 5.4 and earlier converted non leap-year Adar into month 6, instead of month 7.
+		$month -= (Shim::emulateBug54254() && $month == 7 && !$this->leapYear($year)) ? 1 : 0;
+
+		return array($year, $month, $day);
+	}
+
+	/**
+	 * Calculate the Julian Day number of the first day in a year.
+	 *
+	 * @param  int $year
+	 *
+	 * @return int
+	 */
+	protected function yToJd($year) {
+		$div19 = (int)(($year - 1) / 19);
+		$mod19 = ($year - 1) % 19;
+		$months = 235 * $div19 + 12 * $mod19 + (int)((7 * $mod19 + 1) / 19);
+		$parts = 204 + 793 * ($months % 1080);
+		$hours = 5 + 12 * $months + 793 * (int)($months / 1080) + (int)($parts / 1080);
+		$conjunction = 1080 * ($hours % 24) + ($parts % 1080);
+		$jd = 1 + 29 * $months + (int)($hours / 24);
+
+		if (
+			$conjunction >= 19440 ||
+			$jd % 7 === 2 && $conjunction >= 9924 && !$this->leapYear($year) ||
+			$jd % 7 === 1 && $conjunction >= 16789 && $this->leapYear($year - 1)
+		) {
+			$jd++;
+		}
+
+		// The actual year start depends on the day of the week
+		return $jd + self::$ROSH_HASHANAH[$jd % 7];
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number.
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		return
+			$this->yToJd($year) +
+			self::$CUMULATIVE_DAYS[$this->leapYear($year)][$this->yearType($year)][$month] +
+			$day - 1;
+	}
+
+	/**
+	 * Determine whether a year is normal, defective or complete.
+	 *
+	 * @param $year
+	 *
+	 * @return int defective (-1), normal (0) or complete (1)
+	 */
+	private function yearType($year) {
+		$year_length = $this->yToJd($year + 1) - $this->yToJd($year);
+
+		if ($year_length === 353 || $year_length === 383) {
+			return self::DEFECTIVE_YEAR;
+		} elseif ($year_length === 355 || $year_length === 385) {
+			return self::COMPLETE_YEAR;
+		} else {
+			return self::REGULAR_YEAR;
+		}
+	}
+
+	/**
+	 * Calculate the number of days in Heshvan.
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	private function daysInMonthHeshvan($year) {
+		if ($this->yearType($year) === self::COMPLETE_YEAR) {
+			return 30;
+		} else {
+			return 29;
+		}
+	}
+
+	/**
+	 * Calculate the number of days in Kislev.
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	private function daysInMonthKislev($year) {
+		if ($this->yearType($year) === self::DEFECTIVE_YEAR) {
+			return 29;
+		} else {
+			return 30;
+		}
+	}
+
+	/**
+	 * Calculate the number of days in Adar I.
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	private function daysInMonthAdarI($year) {
+		if ($this->leapYear($year)) {
+			return 30;
+		} else {
+			return 0;
+		}
+	}
+
+	/**
+	 * Calculate the number of days in a given month.
+	 *
+	 * @param  int $year
+	 * @param  int $month
+	 *
+	 * @return int
+	 */
+	public function daysInMonth($year, $month) {
+		if ($year === 0 || $month < 1 || $month > 13) {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		} elseif ($month === 2) {
+			return $this->daysInMonthHeshvan($year);
+		} elseif ($month === 3) {
+			return $this->daysInMonthKislev($year);
+		} elseif ($month === 6) {
+			return $this->daysInMonthAdarI($year);
+		} else {
+			return self::$FIXED_MONTH_LENGTHS[$month];
+		}
+	}
+
+	/**
+	 * Month names.
+	 *
+	 * @link https://bugs.php.net/bug.php?id=54254
+	 *
+	 * @return string[]
+	 */
+	public function monthNames() {
+		return array(
+			1 => 'Tishri', 'Heshvan', 'Kislev', 'Tevet', 'Shevat',
+			Shim::emulateBug54254() ? 'AdarI' : 'Adar I',
+			Shim::emulateBug54254() ? 'AdarII' : 'Adar II',
+			'Nisan', 'Iyyar', 'Sivan', 'Tammuz', 'Av', 'Elul',
+		);
+	}
+
+	/**
+	 * Calculate the name of a month, for a specified Julian Day number.
+	 *
+	 * @param  $jd
+	 *
+	 * @return string
+	 */
+	public function jdMonthName($jd) {
+		list($year, $month) = $this->jdToYmd($jd);
+		$months = $this->monthNames();
+
+		if (!$this->leapYear($year) && ($month === 6 || $month === 7)) {
+			return Shim::emulateBug54254() ? 'AdarI' : 'Adar';
+		} else {
+			return $months[$month];
+		}
+	}
+
+	/**
+	 * Calculate the name of a month, for a specified Julian Day number.
+	 *
+	 * @param  int $jd
+	 *
+	 * @return string
+	 */
+	public function jdMonthNameAbbreviated($jd) {
+		return $this->jdMonthName($jd);
+	}
+
+
+	/**
+	 * Hebrew month names.
+	 *
+	 * @link https://bugs.php.net/bug.php?id=54254
+	 *
+	 * @param int $year
+	 *
+	 * @return string[]
+	 */
+	protected function hebrewMonthNames($year) {
+		$leap_year = $this->leapYear($year);
+
+		return array(
+			1 => 'תשרי', 'חשון', 'כסלו', 'טבת', 'שבט',
+			$leap_year ? (Shim::emulateBug54254() ? 'אדר' : 'אדר א׳') : 'אדר',
+			$leap_year ? (Shim::emulateBug54254() ? '\'אדר ב' : 'אדר ב׳') : 'אדר',
+			'ניסן', 'אייר', 'סיון', 'תמוז', 'אב', 'אלול',
+		);
+	}
+
+	/**
+	 * The Hebrew name of a given month.
+	 *
+	 * @param int $year
+	 * @param int $month
+	 *
+	 * @return string
+	 */
+	protected function hebrewMonthName($year, $month) {
+		$months = $this->hebrewMonthNames($year);
+
+		return $months[$month];
+	}
+
+	/**
+	 * Convert a number into Hebrew numerals.
+	 * 
+	 * @param int $number
+	 * @param bool $alafim_garesh
+	 * @param bool $alafim
+	 * @param bool $gereshayim
+	 *
+	 * @return string
+	 */
+	protected function numToHebrew($number, $alafim_garesh, $alafim, $gereshayim) {
+		$hebrew = '';
+		while ($number > 0) {
+			foreach (self::$HEBREW_NUMERALS_FINAL as $n => $h) {
+				if ($number == $n) {
+					$hebrew .= $h;
+					break 2;
+				}
+			}
+			foreach (self::$HEBREW_NUMERALS as $n => $h) {
+				if ($number >= $n) {
+					$hebrew .= $h;
+					$number -= $n;
+					break;
+				}
+			}
+		}
+		return $hebrew;
+	}
+
+	/**
+	 * Convert a Julian Day number into a Hebrew date.
+	 *
+	 * @param int  $jd
+	 * @param bool $alafim_garesh
+	 * @param bool $alafim
+	 * @param bool $gereshayim
+	 *
+	 * @return string $string
+	 */
+	public function jdToHebrew($jd, $alafim_garesh, $alafim, $gereshayim) {
+		list($year, $month, $day) = $this->jdToYmd($jd);
+
+		return
+			$this->numToHebrew($day, $alafim_garesh, $alafim, $gereshayim) . ' ' .
+			$this->hebrewMonthName($year, $month) . ' ' .
+			$this->numToHebrew($year, $alafim_garesh, $alafim, $gereshayim);
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/JulianCalendar.php b/library/fisharebest/ext-calendar/src/JulianCalendar.php
new file mode 100644
index 0000000000..c74e82cda2
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/JulianCalendar.php
@@ -0,0 +1,179 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class JulianCalendar - calculations for the Julian calendar.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class JulianCalendar extends Calendar implements CalendarInterface {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Julian';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 1;
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_JULIAN';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DJULIAN@';
+
+	/**
+	 * Month lengths for regular years and leap-years.
+	 *
+	 * @var int[][]
+	 */
+	protected static $DAYS_IN_MONTH = array(
+		0 => array(1 => 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
+		1 => array(1 => 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
+	);
+
+	/**
+	 * English month names.
+	 *
+	 * @return string[]
+	 */
+	public function monthNames() {
+		return array(
+			1 => 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December',
+		);
+	}
+
+	/**
+	 * Abbreviated English month names.
+	 *
+	 * @return string[]
+	 */
+	public function monthNamesAbbreviated() {
+		return array(
+			1 => 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',
+		);
+	}
+
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		if ($year < 0) {
+			$year++;
+		}
+
+		return $year % 4 == 0;
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		$c = $jd + 32082;
+		$d = (int)((4 * $c + 3) / 1461);
+		$e = $c - (int)(1461 * $d / 4);
+		$m = (int)((5 * $e + 2) / 153);
+		$day = $e - (int)((153 * $m + 2) / 5) + 1;
+		$month = $m + 3 - 12 * (int)($m / 10);
+		$year = $d - 4800 + (int)($m / 10);
+		if ($year < 1) {
+			// 0=1BC, -1=2BC, etc.
+			$year--;
+		}
+
+		return array($year, $month, $day);
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		if ($year < 0) {
+			// 1 B.C.E. => 0, 2 B.C.E> => 1, etc.
+			++$year;
+		}
+		$a = (int)((14 - $month) / 12);
+		$year = $year + 4800 - $a;
+		$month = $month + 12 * $a - 3;
+
+		return $day + (int)((153 * $month + 2) / 5) + 365 * $year + (int)($year / 4) - 32083;
+	}
+
+	/**
+	 * Calculate the number of days in a month.
+	 *
+	 * @param  int $year
+	 * @param  int $month
+	 *
+	 * @return int
+	 */
+	public function daysInMonth($year, $month) {
+		if ($year == 0 || $month < 1 || $month > 12) {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		} else {
+			return static::$DAYS_IN_MONTH[$this->leapYear($year)][$month];
+		}
+	}
+
+	/**
+	 * Get the number of days after March 21 that easter falls, for a given year.
+	 *
+	 * Uses the algorithm found in PHP’s ext/calendar/easter.c
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public function easterDays($year) {
+		// The “golden” number
+		$golden = 1 + $year % 19;
+
+		// The “dominical” number (finding a Sunday)
+		$dom = ($year + (int)($year / 4) + 5) % 7;
+		if ($dom < 0) {
+			$dom += 7;
+		}
+
+		// The uncorrected “Paschal full moon” date
+		$pfm = (3 - 11 * $golden - 7) % 30;
+		if ($pfm < 0) {
+			$pfm += 30;
+		}
+
+		// The corrected “Paschal full moon” date
+		if ($pfm == 29 || $pfm == 28 && $golden > 11) {
+			$pfm--;
+		}
+
+		$tmp = (4 - $pfm - $dom) % 7;
+		if ($tmp < 0) {
+			$tmp += 7;
+		}
+
+		return $pfm + $tmp + 1;
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/PersianCalendar.php b/library/fisharebest/ext-calendar/src/PersianCalendar.php
new file mode 100644
index 0000000000..7d22e7bc33
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/PersianCalendar.php
@@ -0,0 +1,146 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class PersianCalendar - calculations for the Persian (Jalali) calendar.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class PersianCalendar extends Calendar implements CalendarInterface {
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NAME = 'Persian';
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_NUMBER = 5; // PHP uses 0-3
+
+	/** Same as PHP’s ext/calendar extension */
+	const PHP_CALENDAR_SYMBOL = 'CAL_PERSIAN';
+
+	/** See the GEDCOM specification */
+	const GEDCOM_CALENDAR_ESCAPE = '@#DJALALI@';
+
+	/** The earliest Julian Day number that can be converted into this calendar. */
+	const JD_START = 1948321; // 1 Farvardīn 0001 AP = ?? ??? ???? (Julian)
+
+	/**
+	 * Month lengths for regular years and leap-years.
+	 *
+	 * @var int[][]
+	 */
+	protected static $DAYS_IN_MONTH = array(
+		0 => array(1 => 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 29),
+		1 => array(1 => 31, 31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 30),
+	);
+
+	/**
+	 * In each 128 year cycle, the following years are leap years.
+	 *
+	 * @var int[]
+	 */
+	private static $LEAP_YEAR_CYCLE = array(
+		0, 5, 9, 13, 17, 21, 25, 29, 34, 38, 42, 46, 50, 54, 58, 62, 67, 71, 75, 79, 83, 87, 91, 95, 100, 104, 108, 112, 116, 120, 124
+	);
+
+	/**
+	 * Determine whether a year is a leap year.
+	 *
+	 * @param  int  $year
+	 * @return bool
+	 */
+	public function leapYear($year) {
+		return in_array((($year + 2346) % 2820) % 128, self::$LEAP_YEAR_CYCLE);
+	}
+
+	/**
+	 * Convert a Julian day number into a year/month/day.
+	 *
+	 * @param $jd
+	 *
+	 * @return int[];
+	 */
+	public function jdToYmd($jd) {
+		$depoch = $jd - self::YMDtoJD(475, 1, 1);
+		$cycle = (int)($depoch / 1029983);
+		$cyear = $depoch % 1029983;
+		if ($cyear == 1029982) {
+			$ycycle = 2820;
+		} else {
+			$aux1 = (int)($cyear / 366);
+			$aux2 = $cyear % 366;
+			$ycycle = (int)(((2134 * $aux1) + (2816 * $aux2) + 2815) / 1028522) +
+				$aux1 + 1;
+		}
+		$year = $ycycle + (2820 * $cycle) + 474;
+		if ($year <= 0) {
+			$year--;
+		}
+		$yday = ($jd - self::YMDtoJD($year, 1, 1)) + 1;
+		$month = ($yday <= 186) ? ceil($yday / 31) : ceil(($yday - 6) / 30);
+		$day = ($jd - self::YMDtoJD($year, $month, 1)) + 1;
+
+		return array($year, (int)$month, (int)$day);
+	}
+
+	/**
+	 * Convert a year/month/day into a Julian day number
+	 *
+	 * @param int $year
+	 * @param int $month
+	 * @param int $day
+	 *
+	 * @return int
+	 */
+	public function ymdToJd($year, $month, $day) {
+		$epbase = $year - (($year >= 0) ? 474 : 473);
+		$epyear = 474 + $epbase % 2820;
+
+		return
+			$day +
+			(($month <= 7) ? (($month - 1) * 31) : ((($month - 1) * 30) + 6)) +
+			(int)((($epyear * 682) - 110) / 2816) +
+			($epyear - 1) * 365 +
+			(int)($epbase / 2820) * 1029983 +
+			(self::JD_START - 1);
+	}
+
+	/**
+	 * Month names for the calendar.
+	 *
+	 * @return string[]
+	 */
+	public function monthNames() {
+		return array(
+			1 => 'Farvardin', 'Ordibehesht', 'Khordad', 'Tir', 'Mordad', 'Shahrivar',
+			'Mehr', 'Aban', 'Azar', 'Dey', 'Bahman', 'Esfand',
+		);
+	}
+
+	/**
+	 * Calculate the number of days in a month.
+	 *
+	 * @param  int $year
+	 * @param  int $month
+	 *
+	 * @return int
+	 */
+	public function daysInMonth($year, $month) {
+		if ($year == 0 || $month < 1 || $month > self::MAX_MONTHS_IN_YEAR) {
+			return trigger_error('invalid date.', E_USER_WARNING);
+		} else {
+			return static::$DAYS_IN_MONTH[$this->leapYear($year)][$month];
+		}
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/Shim.php b/library/fisharebest/ext-calendar/src/Shim.php
new file mode 100644
index 0000000000..ee7ce55bbb
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/Shim.php
@@ -0,0 +1,567 @@
+<?php
+namespace Fisharebest\ExtCalendar;
+
+/**
+ * class Shim - PHP implementations of functions from the PHP calendar extension.
+ *
+ * @link      http://php.net/manual/en/book.calendar.php
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+class Shim {
+	/**
+	 * Create the necessary shims to emulate the ext/calendar packate.
+	 *
+	 * @return void
+	 */
+	public static function create() {
+		if (!function_exists('cal_info')) {
+			require __DIR__ . '/shims.php';
+		}
+	}
+
+	/**
+	 * Do we need to emulate PHP bug #54254?
+	 *
+	 * This bug relates to the names used for months 6 and 7 in the Jewish calendar.
+	 *
+	 * It was fixed in PHP 5.5.0
+	 *
+	 * @link https://bugs.php.net/bug.php?id=54254
+	 *
+	 * @return bool
+	 */
+	public static function emulateBug54254() {
+		return version_compare(PHP_VERSION, '5.5.0', '<');
+	}
+
+	/**
+	 * Do we need to emulate PHP bug #67960?
+	 *
+	 * This bug relates to the constants CAL_DOW_SHORT and CAL_DOW_LONG.
+	 *
+	 * It will hopefully be fixed in PHP 5.6.1
+	 *
+	 * @link https://bugs.php.net/bug.php?id=67960
+	 * @link https://github.com/php/php-src/pull/806
+	 *
+	 * @return bool
+	 */
+	public static function emulateBug67960() {
+		return true;
+	}
+
+	/**
+	 * Return the number of days in a month for a given year and calendar.
+	 *
+	 * Shim implementation of \cal_days_in_month()
+	 *
+	 * @link https://php.net/cal_days_in_month
+	 *
+	 * @param $calendar
+	 * @param $month
+	 * @param $year
+	 *
+	 * @return int The number of days in the specified month
+	 */
+	public static function calDaysInMonth($calendar, $month, $year) {
+		switch ($calendar) {
+			case CAL_GREGORIAN:
+				$gregorian = new GregorianCalendar;
+				return $gregorian->daysInMonth($year, $month);
+
+			case CAL_JULIAN:
+				$julian= new JulianCalendar;
+				return $julian->daysInMonth($year, $month);
+
+			case CAL_FRENCH:
+				$french = new FrenchCalendar();
+				return $french->daysInMonth($year, $month);
+
+			case CAL_JEWISH:
+				$jewish = new JewishCalendar();
+				return $jewish->daysInMonth($year, $month);
+
+			default:
+				return trigger_error('invalid calendar ID ' . $calendar . '.', E_USER_WARNING);
+		}
+	}
+
+	/**
+	 * Converts from Julian Day Count to a supported calendar.
+	 *
+	 * Shim implementation of \cal_from_jd()
+	 *
+	 * @link https://php.net/cal_from_jd
+	 *
+	 * @param int $jd       Julian Day number
+	 * @param int $calendar Calendar constant
+	 *
+	 * @return array
+	 */
+	public static function calFromJd($jd, $calendar) {
+		switch ($calendar) {
+		case CAL_FRENCH:
+			$french = new FrenchCalendar;
+			return $french->calFromJd($jd);
+
+		case CAL_GREGORIAN:
+			$gregorian = new GregorianCalendar;
+			return $gregorian->calFromJd($jd);
+
+		case CAL_JEWISH:
+			$jewish = new JewishCalendar;
+			return $jewish->calFromJd($jd);
+
+		case CAL_JULIAN:
+			$julian = new JulianCalendar;
+			return $julian->calFromJd($jd);
+
+		default:
+			return trigger_error('invalid calendar ID ' . $calendar, E_USER_WARNING);
+		}
+	}
+
+	/**
+	 * Returns information about a particular calendar.
+	 *
+	 * Shim implementation of \cal_info()
+	 *
+	 * @link https://php.net/cal_info
+	 *
+	 * @param int $calendar
+	 *
+	 * @return array
+	 */
+	public static function calInfo($calendar) {
+		switch ($calendar) {
+			case -1:
+				return array(
+					CAL_GREGORIAN => static::calInfo(CAL_GREGORIAN),
+					CAL_JULIAN => static::calInfo(CAL_JULIAN),
+					CAL_JEWISH => static::calInfo(CAL_JEWISH),
+					CAL_FRENCH => static::calInfo(CAL_FRENCH),
+				);
+			case CAL_FRENCH:
+				$french = new FrenchCalendar;
+				return $french->phpCalInfo();
+
+			case CAL_GREGORIAN:
+				$gregorian = new GregorianCalendar;
+				return $gregorian->phpCalInfo();
+
+			case CAL_JEWISH:
+				$jewish = new JewishCalendar;
+				return $jewish->phpCalInfo();
+
+			case CAL_JULIAN:
+				$julian = new JulianCalendar;
+				return $julian->phpCalInfo();
+
+			default:
+				return trigger_error('invalid calendar ID ' . $calendar . '.', E_USER_WARNING);
+		}
+	}
+
+	/**
+	 *  Converts from a supported calendar to Julian Day Count
+	 *
+	 * Shim implementation of \cal_to_jd()
+	 *
+	 * @link https://php.net/cal_to_jd
+	 *
+	 * @param int $calendar
+	 * @param int $month
+	 * @param int $day
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function calToJd($calendar, $month, $day, $year) {
+		switch ($calendar) {
+		case CAL_FRENCH:
+			return Shim::frenchToJd($month, $day, $year);
+
+		case CAL_GREGORIAN:
+			return Shim::gregorianToJd($month, $day, $year);
+
+		case CAL_JEWISH:
+			return Shim::jewishToJd($month, $day, $year);
+
+		case CAL_JULIAN:
+			return Shim::julianToJd($month, $day, $year);
+
+		default:
+			return trigger_error('invalid calendar ID ' . $calendar . '.', E_USER_WARNING);
+		}
+	}
+
+	/**
+	 * Get Unix timestamp for midnight on Easter of a given year.
+	 *
+	 * Shim implementation of \easter_date()
+	 *
+	 * @link https://php.net/easter_date
+	 *
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function easterDate($year=null) {
+		if ($year === null) {
+			$year = date('Y');
+		} elseif ($year < 1970 || $year > 2037) {
+			return trigger_error('This function is only valid for years between 1970 and 2037 inclusive', E_USER_WARNING);
+		}
+		$gregorian = new GregorianCalendar;
+		$days = $gregorian->easterDays($year);
+
+        // Calculate time-zone offset
+        $date_time = new \DateTime('now', new \DateTimeZone(date_default_timezone_get()));
+        $offset_seconds = $date_time->format('Z');
+
+		if ($days < 11) {
+			return jdtounix($gregorian->ymdToJd($year, 3, $days + 21)) - $offset_seconds;
+		} else {
+			return jdtounix($gregorian->ymdToJd($year, 4, $days - 10)) - $offset_seconds;
+		}
+	}
+
+	/**
+	 * Get number of days after March 21 on which Easter falls for a given year.
+	 *
+	 * Shim implementation of \easter_days()
+	 *
+	 * @link https://php.net/easter_days
+	 *
+	 * @param int $year
+	 * @param int $method   Use the Julian or Gregorian calendar
+	 *
+	 * @return int
+	 */
+	public static function easterDays($year, $method) {
+		$julian = new JulianCalendar;
+		$gregorian = new GregorianCalendar;
+
+		switch ($method) {
+			case CAL_EASTER_ROMAN:
+				if ($year <= 1582) {
+					return $julian->easterDays($year);
+				} else {
+					return $gregorian->easterDays($year);
+				}
+			case CAL_EASTER_ALWAYS_GREGORIAN:
+				return $gregorian->easterDays($year);
+
+			case CAL_EASTER_ALWAYS_JULIAN:
+				return $julian->easterDays($year);
+
+			default: // CAL_EASTER_DEFAULT or any other value
+				if ($year <= 1752) {
+					return $julian->easterDays($year);
+				} else {
+					return $gregorian->easterDays($year);
+				}
+		}
+	}
+
+	/**
+	 * Converts a date from the French Republican Calendar to a Julian Day Count.
+	 *
+	 * Shim implementation of \FrenchToJD()
+	 *
+	 * @link https://php.net/FrenchToJD
+	 *
+	 * @param int $month
+	 * @param int $day
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function frenchToJd($month, $day, $year) {
+		if ($year == 0) {
+			return 0;
+		} else {
+			$french = new FrenchCalendar;
+
+			return $french->ymdToJd($year, $month, $day);
+		}
+	}
+
+	/**
+	 * Converts a Gregorian date to Julian Day Count.
+	 *
+	 * Shim implementation of \GregorianToJD()
+	 *
+	 * @link https://php.net/GregorianToJD
+	 *
+	 * @param int $month
+	 * @param int $day
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function gregorianToJd($month, $day, $year) {
+		if ($year == 0) {
+			return 0;
+		} else {
+			$gregorian = new GregorianCalendar;
+
+			return $gregorian->ymdToJd($year, $month, $day);
+		}
+	}
+
+	/**
+	 * Returns the day of the week.
+	 *
+	 * Shim implementation of \JDDayOfWeek()
+	 *
+	 * @link https://php.net/JDDayOfWeek
+	 * @link https://bugs.php.net/bug.php?id=67960
+	 *
+	 * @param int $julianday
+	 * @param int $mode
+	 *
+	 * @return mixed
+	 */
+	public static function jdDayOfWeek($julianday, $mode) {
+		$julian = new JulianCalendar;
+		$dow = $julian->dayOfWeek($julianday);
+
+		switch ($mode) {
+			case 1: // 1, not CAL_DOW_LONG - see bug 67960
+				return $julian->dayName($dow);
+			case 2: // 2, not CAL_DOW_SHORT - see bug 67960
+				return $julian->dayNameAbbreviated($dow);
+			default: // CAL_DOW_DAYNO or anything else
+				return $dow;
+		}
+	}
+
+	/**
+	 * Returns a month name.
+	 *
+	 * Shim implementation of \JDMonthName()
+	 *
+	 * @link https://php.net/JDMonthName
+	 *
+	 * @param int $julianday
+	 * @param int $mode
+	 *
+	 * @return mixed
+	 */
+	public static function jdMonthName($julianday, $mode) {
+		switch ($mode) {
+			case CAL_MONTH_GREGORIAN_LONG:
+				$gregorian = new GregorianCalendar;
+				return $gregorian->jdMonthName($julianday);
+
+			case CAL_MONTH_JULIAN_LONG:
+				$julian = new JulianCalendar;
+				return $julian->jdMonthName($julianday);
+
+			case CAL_MONTH_JULIAN_SHORT:
+				$julian = new JulianCalendar;
+				return $julian->jdMonthNameAbbreviated($julianday);
+
+			case CAL_MONTH_JEWISH:
+				$jewish = new JewishCalendar;
+				return $jewish->jdMonthName($julianday);
+
+			case CAL_MONTH_FRENCH:
+				$french = new FrenchCalendar;
+				return $french->jdMonthName($julianday);
+
+			default: // CAL_MONTH_GREGORIAN_SHORT and anything else
+				$gregorian = new GregorianCalendar;
+				return $gregorian->jdMonthNameAbbreviated($julianday);
+		}
+	}
+
+	/**
+	 * Converts a Julian Day Count to the French Republican Calendar.
+	 *
+	 * Shim implementation of \JDToFrench()
+	 *
+	 * @link https://php.net/JDToFrench
+	 *
+	 * @param int $juliandaycount A Julian Day number
+	 *
+	 * @return string A string of the form "month/day/year"
+	 */
+	public static function jdToFrench($juliandaycount) {
+		if ($juliandaycount >= FrenchCalendar::JD_START && $juliandaycount <= FrenchCalendar::JD_END) {
+			$french = new FrenchCalendar;
+			$cal = $french->calFromJd($juliandaycount);
+
+			return $cal['date'];
+		} else {
+			return '0/0/0';
+		}
+	}
+
+	/**
+	 * Converts Julian Day Count to Gregorian date.
+	 *
+	 * Shim implementation of \JDToGregorian()
+	 *
+	 * @link https://php.net/JDToGregorian
+	 *
+	 * @param int $julianday A Julian Day number
+	 *
+	 * @return string A string of the form "month/day/year"
+	 */
+	public static function jdToGregorian($julianday) {
+		$gregorian = new GregorianCalendar;
+		$cal = $gregorian->calFromJd($julianday);
+
+		return $cal['date'];
+	}
+
+	/**
+	 * Converts a Julian day count to a Jewish calendar date.
+	 *
+	 * Shim implementation of \JdtoJjewish()
+	 *
+	 * @link https://php.net/JdtoJewish
+	 *
+	 * @param int $juliandaycount A Julian Day number
+	 * @param bool $hebrew        If set, the date is returned in Hebrew text
+	 * @param int $fl             If set, then add alafim and gereshayim to the text
+	 *
+	 * @return string A string of the form "month/day/year"
+	 */
+	public static function jdToJewish($juliandaycount, $hebrew = false, $fl = 0) {
+		$jewish = new JewishCalendar;
+
+		if ($hebrew) {
+			$hebrew = $jewish->jdToHebrew($juliandaycount, $fl & CAL_JEWISH_ADD_ALAFIM_GERESH, $fl & CAL_JEWISH_ADD_ALAFIM, $fl & CAL_JEWISH_ADD_GERESHAYIM);
+			// Our code generates Hebrew punctuation.  PHP uses ASCII punctuation.
+			$hebrew = strtr($hebrew, array(JewishCalendar::GERESH => "'", JewishCalendar::GERSHAYIM => '"'));
+			// Our code generates UTF-8.  PHP generates ISO-8859=8
+			$hebrew = mb_convert_encoding($hebrew, 'ISO-8859-8', 'UTF-8');
+
+			return $hebrew;
+		} else {
+			list($year, $month, $day) = $jewish->jdToYmd($juliandaycount);
+
+			return $month . '/' . $day . '/' . $year;
+		}
+	}
+
+	/**
+	 * Converts a Julian Day Count to a Julian Calendar Date.
+	 *
+	 * Shim implementation of \JDToJulian()
+	 *
+	 * @link https://php.net/JDToJulian
+	 *
+	 * @param int $julianday A Julian Day number
+	 *
+	 * @return string A string of the form "month/day/year"
+	 */
+	public static function jdToJulian($julianday) {
+		$julian = new JulianCalendar;
+		$cal = $julian->calFromJd($julianday);
+
+		return $cal['date'];
+	}
+
+	/**
+	 * Convert Julian Day to Unix timestamp.
+	 *
+	 * Shim implementation of \jdtounix()
+	 *
+	 * @link https://php.net/jdtounix
+	 *
+	 * @param int $jday
+	 *
+	 * @return int
+	 */
+	public static function jdToUnix($jday) {
+		if ($jday >= 2440588 && $jday <= 2465343) {
+			return (int)($jday - 2440588) * 86400;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * Converts a date in the Jewish Calendar to Julian Day Count.
+	 *
+	 * Shim implementation of \JewishToJD()
+	 *
+	 * @link https://php.net/JewishToJD
+	 *
+	 * @param int $month
+	 * @param int $day
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function jewishToJD($month, $day, $year) {
+		if ($year == 0) {
+			return 0;
+		} else {
+			$jewish = new JewishCalendar;
+
+			return $jewish->ymdToJd($year, $month, $day);
+		}
+	}
+
+	/**
+	 * Converts a Julian Calendar date to Julian Day Count.
+	 *
+	 * Shim implementation of \JdToJulian()
+	 *
+	 * @link https://php.net/JdToJulian
+	 *
+	 * @param int $month
+	 * @param int $day
+	 * @param int $year
+	 *
+	 * @return int
+	 */
+	public static function julianToJd($month, $day, $year) {
+		if ($year == 0) {
+			return 0;
+		} else {
+			$julian = new JulianCalendar;
+
+			return $julian->ymdToJd($year, $month, $day);
+		}
+	}
+
+	/**
+	 * Convert Unix timestamp to Julian Day.
+	 *
+	 * Shim implementation of \unixtojd()
+	 *
+	 * @link https://php.net/unixtojd
+	 *
+	 * @param int $timestamp
+	 *
+	 * @return int
+	 */
+	public static function unixToJd($timestamp) {
+		if ($timestamp < 0) {
+			return false;
+		} else {
+			// Convert timestamp based on local timezone
+			return static::GregorianToJd(gmdate('n', $timestamp), gmdate('j', $timestamp), gmdate('Y', $timestamp));
+		}
+	}
+}
diff --git a/library/fisharebest/ext-calendar/src/shims.php b/library/fisharebest/ext-calendar/src/shims.php
new file mode 100644
index 0000000000..e3cf1df6dd
--- /dev/null
+++ b/library/fisharebest/ext-calendar/src/shims.php
@@ -0,0 +1,120 @@
+<?php
+/**
+ * Link the global functions and constants from ext/calendar interface to our
+ * own shim functions.
+ *
+ * @author    Greg Roach <fisharebest@gmail.com>
+ * @copyright (c) 2014 Greg Roach
+ * @license   This program is free software: you can redistribute it and/or modify
+ *            it under the terms of the GNU General Public License as published by
+ *            the Free Software Foundation, either version 3 of the License, or
+ *            (at your option) any later version.
+ *
+ *            This program is distributed in the hope that it will be useful,
+ *            but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *            MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *            GNU General Public License for more details.
+ *
+ *            You should have received a copy of the GNU General Public License
+ *            along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use Fisharebest\ExtCalendar\FrenchCalendar;
+use Fisharebest\ExtCalendar\GregorianCalendar;
+use Fisharebest\ExtCalendar\JewishCalendar;
+use Fisharebest\ExtCalendar\JulianCalendar;
+use Fisharebest\ExtCalendar\Shim;
+
+define(FrenchCalendar::PHP_CALENDAR_NAME, FrenchCalendar::PHP_CALENDAR_NUMBER);
+define(GregorianCalendar::PHP_CALENDAR_NAME, GregorianCalendar::PHP_CALENDAR_NUMBER);
+define(JewishCalendar::PHP_CALENDAR_NAME, JewishCalendar::PHP_CALENDAR_NUMBER);
+define(JulianCalendar::PHP_CALENDAR_NAME, JulianCalendar::PHP_CALENDAR_NUMBER);
+define('CAL_NUM_CALS', 4);
+define('CAL_DOW_DAYNO', 0);
+define('CAL_DOW_SHORT', Shim::emulateBug67960() ? 1 : 2);
+define('CAL_DOW_LONG', Shim::emulateBug67960() ? 2 : 1);
+define('CAL_MONTH_GREGORIAN_SHORT', 0);
+define('CAL_MONTH_GREGORIAN_LONG', 1);
+define('CAL_MONTH_JULIAN_SHORT', 2);
+define('CAL_MONTH_JULIAN_LONG', 3);
+define('CAL_MONTH_JEWISH', 4);
+define('CAL_MONTH_FRENCH', 5);
+define('CAL_EASTER_DEFAULT', 0);
+define('CAL_EASTER_ROMAN', 1);
+define('CAL_EASTER_ALWAYS_GREGORIAN', 2);
+define('CAL_EASTER_ALWAYS_JULIAN', 3);
+define('CAL_JEWISH_ADD_ALAFIM_GERESH', 2);
+define('CAL_JEWISH_ADD_ALAFIM', 4);
+define('CAL_JEWISH_ADD_GERESHAYIM ', 8);
+
+function cal_days_in_month($calendar, $month, $year) {
+	return Shim::calDaysInMonth($calendar, $month, $year);
+}
+
+function cal_from_jd($jd, $calendar) {
+	return Shim::calFromJd($jd, $calendar);
+}
+
+function cal_info($calendar = -1) {
+	return Shim::calInfo($calendar);
+}
+
+function cal_to_jd($calendar, $month, $day, $year) {
+	return Shim::calToJd($calendar, $month, $day, $year);
+}
+
+function easter_date($year = null) {
+	return Shim::easterDate($year);
+}
+
+function easter_days($year=null, $method=CAL_EASTER_DEFAULT) {
+	return Shim::easterDays($year ? $year : date('Y'), $method);
+}
+
+function FrenchToJD($month, $day, $year) {
+	return Shim::FrenchToJD($month, $day, $year);
+}
+
+function GregorianToJD($month, $day, $year) {
+	return Shim::GregorianToJD($month, $day, $year);
+}
+
+function JDDayOfWeek($julianday, $mode = CAL_DOW_DAYNO) {
+	return Shim::JDDayOfWeek($julianday, $mode);
+}
+
+function JDMonthName($julianday, $mode) {
+	return Shim::JDMonthName($julianday, $mode);
+}
+
+function JDToFrench($juliandaycount) {
+	return Shim::JDToFrench($juliandaycount);
+}
+
+function JDToGregorian($julianday) {
+	return Shim::JDToGregorian($julianday);
+}
+
+function jdtojewish($juliandaycount, $hebrew = false, $fl = 0) {
+	return Shim::jdtojewish($juliandaycount, $hebrew, $fl);
+}
+
+function JDToJulian($julianday) {
+	return Shim::JDToJulian($julianday);
+}
+
+function jdtounix($jday) {
+	return Shim::jdtounix($jday);
+}
+
+function JewishToJD($month, $day, $year) {
+	return Shim::JewishToJD($month, $day, $year);
+}
+
+function JulianToJD($month, $day, $year) {
+	return Shim::JulianToJD($month, $day, $year);
+}
+
+function unixtojd($timestamp = null) {
+	return Shim::unixtojd($timestamp ? $timestamp : time());
+}