gregoriantojd()

<?Php
echo gregoriantojd(12,22,2021); // Output is 2459571
echo "<br>";
echo gregoriantojd(13,22,2021); // Output is 0
echo "<br>";
echo gregoriantojd(11,32,2019); // Output is 0
echo "<br>";
echo gregoriantojd(2,30,2019); // Output is 2458545
?>

Example

 int gregoriantojd ( int $month , int $day , int $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

Output is The julian day for the given gregorian date as an integer.

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";
}

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