What is the primary purpose of Calendar Functions in PHP?

Complete reference for PHP calendar manipulation functions, conversions, and Julian day calculations.

Are Calendar Functions enabled by default in PHP 8?

Yes, standard Calendar Functions are core parts of the PHP standard library and require no external PECL extensions.

PHP Calendar Functions Reference Guide

This reference page provides a comprehensive, alphabetical catalog of all built-in Calendar Functions in PHP. In modern web development and university exams (BCA, BSc CS, B.Tech), understanding these core functions accelerates programming speed and prevents you from reinventing existing standard library tools.

Quick Tip: In modern PHP 8, you can use named arguments to specify parameters without having to memorize optional default argument positions!

Function	Description
cal_days_in_month()	Returns the number of days in a month for a specified year and calendar
cal_from_jd()	Converts a Julian Day Count into a date of a specified calendar
cal_info()	Returns information about a specified calendar
cal_to_jd()	Converts a date in a specified calendar to Julian Day Count
easter_date()	Returns the Unix timestamp for midnight on Easter of a specified year
easter_days()	Returns the number of days after March 21, that the Easter Day is in a specified year
frenchtojd()	Converts a French Republican date to a Julian Day Count
gregoriantojd()	Converts a Gregorian date to a Julian Day Count
jddayofweek()	Returns the day of the week
jdmonthname()	Returns a month name
jdtofrench()	Converts a Julian Day Count to a French Republican date
jdtogregorian()	Converts a Julian Day Count to a Gregorian date
jdtojewish()	Converts a Julian Day Count to a Jewish date
jdtojulian()	Converts a Julian Day Count to a Julian date
jdtounix()	Converts Julian Day Count to Unix timestamp
jewishtojd()	Converts a Jewish date to a Julian Day Count
juliantojd()	Converts a Julian date to a Julian Day Count
unixtojd()	Converts Unix timestamp to Julian Day Count

PHP Calendar Functions Reference Guide

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