Date format validation in PHP

Below code is designed for date format validation in PHP. Even though simple, but useful many times. Actually PHP provides date validation function as checkdate(). See the detail below.

 function checkDateFormat($date)
{
	//match the format of the date
	if (preg_match ("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts))
	{
		//check weather the date is valid of not
		if(checkdate($parts[2],$parts[3],$parts[1]))	return true;
		else return false;
	}
	else return false;
}