PHP | cal_to_jd() Function

Last Updated : 11 Jul, 2025

The cal_to_jd() function is an inbuilt function in PHP which is used to converts a specified date into Julian Day Count. The cal_to_jd() function calculates the Julian day count for a date in the specified calendar. This function supports CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH calendars.
Syntax:  

int cal_to_jd( $calendar, $month, $day, $year )


Parameters: This function accepts four parameters as mentioned above and described below:  

  • $calendar: It is used to specify the calendar for calculation. The calendar values are Gregorian calendar, French calendar, Jewish calendar and Julian calendar.
  • $month: It is used to specify the Month in the selected calendar.
  • $day: It is used to specify the Day in the selected calendar.
  • $year : It is used to specify the year in the selected calendar.


Return Value: This function returns a Julian Day number.
Below programs illustrate the cal_to_jd() function in PHP.
Program 1: 

php 

    
// Converts a Gregorian calendar Date 
// into Julian Day number.
$date = cal_to_jd(CAL_GREGORIAN, 11, 03, 2007);

// Prints the conversion of date to 
// Julian Day number.
echo $date;
?>

Output: 
2454408

 

Program 2:  

php 


// Converts Julian calendar Date into 
// Julian Day count.
$date = cal_to_jd(CAL_JULIAN, 7, 20, 20017);

// Prints the above conversion.
echo $date;
?>

Output: 
9032468

 

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Reference: https://www.php.net/manual/en/function.cal-to-jd.php

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