PHP cal_to_jd() Function

The PHP cal_to_jd() function calculates the Julian day count for a date in the specified calendar. Supported calendars by this function are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH.

Syntax

cal_to_jd(calendar, month, day, year)

Parameters

`calendar`	`Required.` Specify the Calendar to convert from. Must be one of the following values: CAL_GREGORIAN CAL_JULIAN CAL_JEWISH CAL_FRENCH
`month`	`Required.` Specify the month as a number, the valid range depends on the calendar.
`day`	`Required.` Specify the day as a number, the valid range depends on the calendar.
`year`	`Required.` Specify the year as a number, the valid range depends on the calendar.

Return Value

Returns the Julian day count for a date in the specified calendar.

Exceptions

NA.

Example:

The example below shows the usage of cal_to_jd() function.

<?php
//converting a Gregorian calendar Date
//into Julian Day count
$date = cal_to_jd(CAL_GREGORIAN, 10, 23, 2015);
 
//displaying the result
echo "The Julian day count is: $date";
?>

The output of the above code will be:

The Julian day count is: 2457319

Example:

Consider one more example where a date in other calendar types are converted into Julian Day count.

<?php
//converting a Jewish calendar Date
//into Julian Day count
$date = cal_to_jd(CAL_JEWISH, 10, 23, 2015);
 
//displaying the result
echo "The Julian day count is: $date \n";

//converting a French Republican calendar 
//Date into Julian Day count
$date = cal_to_jd(CAL_FRENCH, 10, 23, 12);
 
//displaying the result
echo "The Julian day count is: $date \n";
?>

The output of the above code will be:

The Julian day count is: 1083864 
The Julian day count is: 2380150

❮ PHP Calendar Reference