PHP Calendar Functions
PHP Calendar Introduction
The calendar functions are useful when working with different calendar formats. The standard it is based on is the Julian
day count (Julian day count is a count of days starting from January 1, 4713 B.C.).
Note that the Julian day count is not the same as the Julian calendar!
Note: To convert between calendar formats, you must first convert to Julian
day
count, then to the calendar format.
Installation
The windows version of PHP has built-in support for the calendar extension.
So, the calendar functions will work automatically.
However, if you are running the Linux version of PHP, you will have to compile PHP with --enable-calendar to get the
calendar functions to work.
PHP Calendar Functions
PHP: indicates the earliest version of PHP that supports the
function.
| Function |
Description |
PHP |
| cal_days_in_month() |
Returns the number of days in a month for a specified year and
calendar |
4 |
| cal_from_jd() |
Converts a Julian day count into a date of a specified
calendar |
4 |
| cal_info() |
Returns information about a given calendar |
4 |
| cal_to_jd() |
Converts a date to Julian day count |
4 |
| easter_date() |
Returns the Unix timestamp for midnight on Easter of a
specified
year |
3 |
| easter_days() |
Returns the number of days after March 21, on which Easter
falls for a specified year |
3 |
| FrenchToJD() |
Converts a French Republican date to a
Julian day count |
3 |
| GregorianToJD() |
Converts a Gregorian date to a Julian day count |
3 |
| JDDayOfWeek() |
Returns the day of a week |
3 |
| JDMonthName() |
Returns a month name |
3 |
| JDToFrench() |
Converts a Julian day count to a French Republican
date |
3 |
| JDToGregorian() |
Converts a Julian day count to a Gregorian date |
3 |
| jdtojewish() |
Converts a Julian day count to a Jewish date |
3 |
| JDToJulian() |
Converts a Julian day count to a Julian date |
3 |
| jdtounix() |
Converts a Julian day count to a Unix timestamp |
4 |
| JewishToJD() |
Converts a Jewish date to a Julian day count |
3 |
| JulianToJD() |
Converts a Julian date to a Julian day count |
3 |
| unixtojd() |
Converts a Unix timestamp to a Julian day count |
4 |
PHP Calendar Constants
PHP: indicates the earliest version of PHP that supports the
constant.
| Constant |
Description |
PHP |
| CAL_GREGORIAN |
Gregorian calendar |
3 |
| CAL_JULIAN |
Julian calendar |
3 |
| CAL_JEWISH |
Jewish calendar |
3 |
| CAL_FRENCH |
French Republican calendar |
3 |
| CAL_NUM_CALS |
|
3 |
| CAL_DOW_DAYNO |
|
3 |
| CAL_DOW_SHORT |
|
3 |
| CAL_DOW_LONG |
|
3 |
| CAL_MONTH_GREGORIAN_SHORT |
|
3 |
| CAL_MONTH_GREGORIAN_LONG |
|
3 |
| CAL_MONTH_JULIAN_SHORT |
|
3 |
| CAL_MONTH_JULIAN_LONG |
|
3 |
| CAL_MONTH_JEWISH |
|
3 |
| CAL_MONTH_FRENCH |
|
3 |
| CAL_EASTER_DEFAULT |
|
4 |
| CAL_EASTER_DEFAULT |
|
4 |
| CAL_EASTER_ROMAN |
|
4 |
| CAL_EASTER_ALWAYS_GREGORIAN |
|
4 |
| CAL_EASTER_ALWAYS_JULIAN |
|
4 |
| CAL_JEWISH_ADD_ALAFIM_GERESH |
|
5 |
| CAL_JEWISH_ADD_ALAFIM |
|
5 |
| CAL_JEWISH_ADD_GERESHAYIM |
|
5 |
| 
