PHP | unixtojd() Function Last Updated : 20 Jul, 2021 Comments Improve Suggest changes Like Article Like Report The unixtojd() is a built-in function in PHP which converts the unix timestamp to Julian Day count. The UNIX timestamp is a way to track time as a running total of seconds. This count starts at the Unix Epoch on January 1st, 1970 at UTC. Therefore, the UNIX timestamp is merely the number of seconds between a particular date and the Unix Epoch. Syntax: unixtojd( $unix ) Parameter: The function accepts a single parameter as shown above which is optional. $unix specifies the unix timestamp which is converted to Julian Day count. Return Value: The function returns the unix timestamp passed as parameter converted to Julian day Integer. If no parameter is passed, it returns the current Julian Day integer. We can convert the Julian day integer to Gregorian date to know the exact date using jdtogregorian() function. Examples: Input : $unix = 1524909427 Output : 2458237 Explanation: The Gregorian date is 4/28/2018 of the given unix timestamp Input : $unix = 5677896 Output : 2440653 Explanation: The Gregorian date is 3/7/1970 of the given unix timestamp Note: The function can only take Julian Day integer till Gregorian date 1/19/2038 since on this date the Unix Time Stamp will cease to work due to a 32-bit overflow. Below programs illustrate the unixtojd() Function. Program 1: The program below demonstrates the use of function when no parameter is passed. PHP <?php // PHP program to demonstrate the use of unixtojd() // function when no parameter is passed // takes the current date as unix timestamp $jd = unixtojd(); // prints the julian Day integer echo "The Julian Day integer is ", ($jd), "\n"; // prints the corresponding Gregorian date echo "The Gregorian date is ", jdtogregorian($jd); ?> Output: The Julian Day integer is 2458237 The Gregorian date is 4/28/2018 Program 2: The program below demonstrates the use of function when parameter is passed. PHP <?php // PHP program to demonstrate the use of unixtojd() // function when parameter is passed // takes a unix timestamp in parameter $jd = unixtojd(5677896); // prints the julian Day integer echo "The Julian Day integer is ", ($jd), "\n"; // prints the corresponding Gregorian date echo "The Gregorian date is ", jdtogregorian($jd); ?> Output: The Julian Day integer is 2440653 The Gregorian date is 3/7/1970 Reference: http://php.net/manual/en/function.unixtojd.php Comment More infoAdvertise with us G gopaldave Follow Improve Article Tags : Misc Web Technologies PHP PHP-Calendar Practice Tags : Misc Similar Reads PHP | cal_days_in_month( ) Function The cal_days_in_month( ) function in PHP is an inbuilt function which is used to return the number of days in a month for a specific year and according to a specific calendar such as Gregorian calendar, French calendar, Jewish calendar etc. The cal_days_in_month() function takes three parameters whi 2 min read PHP | cal_from_jd() Function The cal_from_jd() function is an inbuilt function in PHP that is used to convert a Julian Day Count into a supported calendar such as the Gregorian calendar, French Calendar, Jewish calendar, etc. This function accepts two parameters $jd and $calendar and returns the array containing calendar inform 2 min read PHP | cal_info( ) Function The cal_info() function in PHP is an inbuilt function that is used to return information about a specified calendar. 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