PHP | jdtojulian() Function Last Updated : 11 Jul, 2025 Comments Improve Suggest changes 2 Likes Like Report The jdtojulian() function is an inbuilt function in PHP that is used to convert a Julian day count to a Julian calendar date. It converts Julian Day Count to a string containing the Julian Calendar Date in the month/day/year format.Syntax: int jdtojulian( $julianday ) Parameters: This function accepts a single parameter $julianday which is mandatory. It contains Julian's day as an integer.Return Value: This function returns the Julian Date as a string in the month/day/year format.The below programs illustrate the jdtojulian() function in PHP. Program 1: php <?php // Converts a Julian calendar date // to Julian Day count. $jdate = juliantojd(10, 25, 1996); // Print the Julian Day count. echo "JulianToJD is : ".$jdate . "\n"; // First converts the julian day to Julian // Calendar date and then print it. echo "JDToJulian is : ".jdtojulian($jdate); ?> Output: JulianToJD is : 2450395 JDToJulian is : 10/25/1996 Program 2: php <?php // Converts Julian calendar Date // to Julian Day count. $jdate = juliantojd(1, 10, 1998); // Print the Julian Day count echo "Julian Day Count : ".$jdate . "\n"; // Converts Julian Day count to // the Julian calendar Date $julian = jdtojulian($jdate); // Print the julian calendar Date. echo "Julian Calendar Date : ".$julian; ?> Output: Julian Day Count : 2450837 Julian Calendar Date : 1/10/1998 Related Articles: PHP | cal_days_in_month() FunctionPHP | easter_days() Function Reference: https://www.php.net/manual/en/function.jdtojulian.php Comment U ukasp Follow 2 Improve U ukasp Follow 2 Improve Article Tags : Web Technologies PHP PHP-Calendar PHP-function Explore PHP Tutorial 8 min read BasicsPHP Syntax 4 min read PHP Variables 5 min read PHP | Functions 8 min read PHP Loops 4 min read ArrayPHP Arrays 5 min read PHP Associative Arrays 4 min read Multidimensional arrays in PHP 5 min read Sorting Arrays in PHP 4 min read OOPs & InterfacesPHP Classes 2 min read PHP | Constructors and Destructors 5 min read PHP Access Modifiers 4 min read Multiple Inheritance in PHP 4 min read MySQL DatabasePHP | MySQL Database Introduction 4 min read PHP Database connection 2 min read PHP | MySQL ( Creating Database ) 3 min read PHP | MySQL ( Creating Table ) 3 min read PHP AdvancePHP Superglobals 6 min read PHP | Regular Expressions 12 min read PHP Form Handling 4 min read PHP File Handling 4 min read PHP | Uploading File 3 min read PHP Cookies 9 min read PHP | Sessions 7 min read Like