PHP Calendar Functions

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP Calendar Functions.

The calendar extension provides a series of functions for simplifying the conversion between the different calendar formats.

It is based on Julian Day Count. The Julian Day Count is a count of days starting from January 1st, 4713 B.C. To convert between the calendar systems, you will first need to convert to the Julian Day Count, and finally to the calendar system which you want.

Installation

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

Runtime Configuration

It has no configuration directives defined in php.ini.

READ: PHP | usort() Function

PHP Calendar Functions

The following below is the list of calendar functions that are supported in PHP. PHP indicates the earliest versions of PHP that supports these functions -

Sr.No	Function & Description	PHP
1	cal_days_in_month() Returns the number of days in a month for a specified year and calendar	4
2	cal_from_jd() Converts a Julian day count into a date of a specified calendar	4
3	cal_from_jd() Returns information about a given calendar	4
4	cal_to_jd() Converts a date to Julian day count	4
5	easter_date() Returns the Unix timestamp for midnight on Easter of a specified year	3
6	easter_days() Returns the number of days after March 21, on which Easter falls for a specified year	3
7	FrenchToJD() Converts a French Republican date to a Julian day count	3
8	GregorianToJD() Converts a Gregorian date to a Julian day count	3
9	JDDayOfWeek() Returns the day of a week	3
10	JDMonthName() Returns a month name	3
11	JDToFrench() Converts a Julian day count to a French Republican date	3
12	JDToGregorian() Converts a Julian day count to a Gregorian date	3
13	jdtojewish() Converts a Julian day count to a Jewish date	3
14	JDToJulian() Converts a Julian day count to a Julian date	3
15	jdtounix() Converts a Julian day count to a Unix timestamp	4
16	JewishToJD() Converts a Jewish date to a Julian day count	3
17	JulianToJD() Converts a Julian date to a Julian day count	3
18	unixtojd() Converts a Unix timestamp to a Julian day count

READ: PHP | sort() Function

In our subsequent tutorial posts, we will be studying about the above listed functions.

PHP Calendar Constants

Following is the list of constants available in PHP -

Sr.No	Constant & Description	PHP
1	CAL_GREGORIAN Gregorian calendar	3
2	CAL_JULIAN Julian calendar	3
3	CAL_JEWISH Jewish calendar	3
4	CAL_FRENCH French Republican calendar	3
5	CAL_NUM_CALS	3
6	CAL_DOW_DAYNO	3
7	CAL_DOW_SHORT	3
8	CAL_DOW_LONG	3
9	CAL_MONTH_GREGORIAN_SHORT	3
10	CAL_MONTH_GREGORIAN_LONG	3
11	CAL_MONTH_JULIAN_SHORT	3
12	CAL_MONTH_JULIAN_LONG	3
13	CAL_MONTH_JEWISH	3
14	CAL_MONTH_FRENCH	3
15	CAL_EASTER_DEFAULT	4
16	CAL_EASTER_DEFAULT	4
17	CAL_EASTER_ROMAN	4
18	CAL_EASTER_ALWAYS_GREGORIAN	4
19	CAL_EASTER_ALWAYS_JULIAN	4
20	CAL_JEWISH_ADD_ALAFIM_GERESH	5
21	CAL_JEWISH_ADD_ALAFIM	5
22	CAL_JEWISH_ADD_GERESHAYIM

READ: PHP | rsort() Function

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about PHP cal_days_in_month() Function.

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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