   #PHP Manual Function Reference bzwrite cal_days_in_month

   PHP Manual
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VI. Calendar functions

Introduction

   The calendar extension presents a series of functions to simplify
   converting between different calendar formats. The intermediary or
   standard it is based on is the Julian Day Count. The Julian Day Count
   is a count of days starting from January 1st, 4713 B.C. To convert
   between calendar systems, you must first convert to Julian Day Count,
   then to the calendar system of your choice. Julian Day Count is very
   different from the Julian Calendar! For more information on Julian Day
   Count, visit http://www.hermetic.ch/cal_stud/jdn.htm. For more
   information on calendar systems visit
   http://www.boogle.com/info/cal-overview.html. Excerpts from this page
   are included in these instructions, and are in quotes.

Installation

   To get these functions to work, you have to compile PHP with
   --enable-calendar.

   The windows version of PHP has built in support for this extension.
   You do not need to load any additional extension in order to use these
   functions.

Runtime Configuration

   This extension has no configuration directives defined in php.ini.

Resource Types

   This extension has no resource types defined.

Predefined Constants

   The constants below are defined by this extension, and will only be
   available when the extension has either been compiled into PHP or
   dynamically loaded at runtime.

   CAL_GREGORIAN (integer)

   CAL_JULIAN (integer)

   CAL_JEWISH (integer)

   CAL_FRENCH (integer)

   CAL_NUM_CALS (integer)

   CAL_DOW_DAYNO (integer)

   CAL_DOW_SHORT (integer)

   CAL_DOW_LONG (integer)

   CAL_MONTH_GREGORIAN_SHORT (integer)

   CAL_MONTH_GREGORIAN_LONG (integer)

   CAL_MONTH_JULIAN_SHORT (integer)

   CAL_MONTH_JULIAN_LONG (integer)

   CAL_MONTH_JEWISH (integer)

   CAL_MONTH_FRENCH (integer)

   The following constants are available since PHP 4.3.0 :

   CAL_EASTER_DEFAULT (integer)

   CAL_EASTER_ROMAN (integer)

   CAL_EASTER_ALWAYS_GREGORIAN (integer)

   CAL_EASTER_ALWAYS_JULIAN (integer)

   The following constants are available since PHP 5.0.0 :

   CAL_JEWISH_ADD_ALAFIM_GERESH (integer)

   CAL_JEWISH_ADD_ALAFIM (integer)

   CAL_JEWISH_ADD_GERESHAYIM (integer)

   Table of Contents
   cal_days_in_month -- Return the number of days in a month for a given
          year and calendar

   cal_from_jd -- Converts from Julian Day Count to a supported calendar
   cal_info -- Returns information about a particular calendar
   cal_to_jd -- Converts from a supported calendar to Julian Day Count
   easter_date --  Get Unix timestamp for midnight on Easter of a given
          year

   easter_days --  Get number of days after March 21 on which Easter
          falls for a given year

   FrenchToJD --  Converts a date from the French Republican Calendar to
          a Julian Day Count

   GregorianToJD --  Converts a Gregorian date to Julian Day Count
   JDDayOfWeek -- Returns the day of the week
   JDMonthName -- Returns a month name
   JDToFrench --  Converts a Julian Day Count to the French Republican
          Calendar

   JDToGregorian -- Converts Julian Day Count to Gregorian date
   jdtojewish --  Converts a Julian day count to a Jewish calendar date
   JDToJulian --  Converts a Julian Day Count to a Julian Calendar Date
   jdtounix -- Convert Julian Day to Unix timestamp
   JewishToJD --  Converts a date in the Jewish Calendar to Julian Day
          Count

   JulianToJD --  Converts a Julian Calendar date to Julian Day Count
   unixtojd -- Convert Unix timestamp to Julian Day
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