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.
To get these functions to work, you have to compile PHP with
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.
This extension has no configuration directives defined in php.ini.
This extension has no resource types defined.
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.
The following constants are available since PHP 4.3.0 :
The following constants are available since PHP 5.0.0 :