Core PHP Programming: Using PHP to Build Dynamic Web Sites

Alternative Calendars

PHP offers a powerful way to convert dates from one calendar system to another. In order to do this, you must first convert a date into a Julian Day Count. You then convert that integer back into a date according to another calendar.

These functions require the calendar extension. You may load it dynamically, or compile it into PHP.

integer easter_date(integer year)

Use easter_date to get the timestamp for midnight on Easter for a given year.

<?
     print(easter_date(2000));
?>

integer easter_days(integer year)

The easter_days function returns the number of days after March 21 on which Easter falls for the given year.

<?
     print(easter_days(2000));
?>

integer frenchtojd(integer month, integer day, integer year)

The frenchtojd ...