===== Syntax =====

<code php>bool checkdate(int $month, int $day, int $year)</code>

//(PHP 4, PHP 5)//

^ $month | Month number (1 - 12) |
^ $day | Day number (1 - 31) |
^ $year | Year number (e.g.: 2008) |
^ RETURNS | True or false indicating whether the values make a valid date |

===== What it Does =====

Determines whether the numbers for //month//, //day//, and //year// can be combined to form a valid date.  Use this to validate input when these three values are entered seperately.

===== Example =====

<code php>
// check the date input on the form
if (!checkdate($_POST['month'], $_POST['day'], $_POST['year']))
    $err = 'Invalid date entered, please try again';
</code>