The month of PHP functions : validating dates

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Validating a date is a common task, especially on the web, through forms. Thanksfully, checkdate() is up to the job.

checkdate() checks that a date has
valide values, in Gregorian calendar. Its major advantage is that checkdate() will take into
account leap years.


Example 1 : check different dates

<?php
 
var_dump(checkdate(12, 31, 2000)); // TRUE
 
var_dump(checkdate(2, 29, 2001)); // FALSE
 
?>

Keep in mind

• checkdate() has been available since PHP 4
• mktime() would accept 2/29/2001, but turn it automatically into 3/1/2001