(PHP 5 >= 5.2.0)
timezone_transitions_get — Returns all transitions for the timezone
DateTimeZone object.
Returns numerically indexed array containing associative array with all transitions on success or FALSE on failure.
Example #1 A timezone_transitions_get() example
<?php
$timezone = new DateTimeZone("CET");
print_r(reset($timezone->getTransitions()));
?>
The above example will output something similar to:
Array ( [ts] => -1693706400 [time] => 1916-04-30T22:00:00+0000 [offset] => 7200 [isdst] => 1 [abbr] => CEST )