Needed to use this recently to create a specificity parameter for an API at work, it gives you a key/value array from an ISO date string regardless of what is actually set in the string (e.g. if you give 2011-06-07 04 you’ll get an array back as array(‘year’=>2011, ‘month’ => 6, ‘day’ => 7, ‘hour’ => 4). If you enter 2011-06-07 04:43 you’ll get: array(‘year’=>2011, ‘month’ => 6, ‘day’ => 7, ‘hour’ => 4, ‘minute’ => 43), works from just a year all the way to seconds.
/**
* Gets the parts of a date that are set in an ISO date string.
*
* @param string $date date/time to use.
*
* @return array
*/
public static function getDateParts($date)
{
$matches = array();
preg_match(
'/(
(
(
(
(
(?<year>d{4})
(-(?<month>d{2}))?
)
(-(?<day>d{2}))?
)
(s?(?<hour>d{2}))?
)
(:(?<minute>d{2}))?
)
(:(?<second>d{2}))?
)/x',
$date,
$matches
);
$date = array_map('intval', array_intersect_key($matches, array_flip(array('year', 'month', 'day', 'hour', 'minute', 'second'))));
return $date;
}