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PHP Date

checkdate() Function

The Gregorian Calendar was created by Pope Gregory, hence the name. The checkdate() function is used to validate a Gregorian date.

bool(false)
bool(false)
bool(true)

<?php
var_dump(checkdate(12,31,-400)); // this is false as Pope Gregory was not even born yet to create the Gregorian Calendar
echo "<br>";
var_dump(checkdate(2,29,2003)); // this is false as 2003 was not a leap year so February cannot have 29 days
echo "<br>";
var_dump(checkdate(2,29,2004));
?>