gregoriantojd()
Convert a Gregorian date to a Julian Day
gregoriantojd() converts Gregorian month, day and year values to a Julian Day count.
$jd = gregoriantojd(9, 14, 2026);
echo $jd;<?php
$month = 2;
$day = 29;
$year = 2024;
if (checkdate($month, $day, $year)) {
echo gregoriantojd($month, $day, $year);
}
?>For Gregorian user input, validate with
Syntax
checkdate() before conversion. gregoriantojd() can normalize overflowing day values rather than acting as a strict date validator.gregoriantojd($month, $day, $year)| Parameter | DESCRIPTION |
|---|---|
| $year | Required : Year in four digits between -4714 and 9999 |
| $day | Required : between 1 to 31 |
| $month | Required : Number from 1 to 12 |
Example: Converting Leap Year Date
$jd = gregoriantojd(2, 29, 2020); // Leap year date
echo "Julian Day: " . $jd; // Output: Julian Day number for Feb 29, 2020
Example: Validating Date Before Conversion
More on checkdate()if (checkdate(2, 29, 2021)) {
$jd = gregoriantojd(2, 29, 2021);
echo "Julian Day: " . $jd;
} else {
echo "Invalid date";
}
Information about available Calendars
Calendar Functions
Subhendu Mohapatra
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