VI. Calendar functions
The calendar functions are only available if you have compiled the calendar extension,
found in either the "dl" or "ext" subdirectories of your PHP source code. Please see the README
file before using it.
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 way earlier than any date most people would need
to track (somewhere around 4000bc). 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 calendar systems visit
http://genealogy.org/~scottlee/cal-overview.html. Excerpts from this page are included in these
instructions, and are in quotes.
- Table of Contents
- JDToGregorian -- Converts Julian Day Count
to Gregorian date
- GregorianToJD -- Converts a Gregorian date
to Julian Day Count
- JDToJulian -- Converts a Julian Day Count to
a Julian Calendar Date
- JulianToJD -- Converts a Julian Calendar date
to Julian Day Count
- JDToJewish -- Converts a Julian Day Count to
the Jewish Calendar
- JewishToJD -- Converts a date in the Jewish
Calendar to Julian Day Count
- JDToFrench -- Converts a Julian Day Count to
the French Republican Calendar
- FrenchToJD -- Converts a date from the French
Republican Calendar to a Julian Day Count
- JDMonthName -- Returns a month name
- JDDayOfWeek -- Returns the day of the
week
- 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
- unixtojd -- Convert UNIX timestamp to Julian
Day
- jdtounix -- Convert Julian Day to UNIX
timestamp
- cal_days_in_month -- Return the number
of days in a month for a given year and calendar
- cal_to_jd -- Converts from a supported calendar
to Julian Day Count
- cal_from_jd -- Converts from Julian Day Count
to a supported calendar and return extended information
- cal_info -- Returns information about a
particular calendar
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