PHP 12 hour to 24 hrs time format conversion

PHP 12 hour time 24 hour time convertion:
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<?PHP

// 24-hour time to 12-hour time
$time_in_12_hour_format  = DATE("g:i a", STRTOTIME("13:30"));

// 12-hour time to 24-hour time
$time_in_24_hour_format  = DATE("H:i", STRTOTIME("1:30 pm"));

?>

REf :link Thax for link
http://psoug.org/snippet/Convert_12_to_24_hour_time_and_vice_versa_241.htm