Jim L. I did't actually consider that wide range of time values.  Here
is an update. Still  this can be written without help of regex. I must
add one more thing that a '00:01' is invalid in 12 hour format. OP
wants it to be 12-hour format.

function valid_time($time){
        $m = substr($time, -2);
        $h = (explode(':', substr($time, 0, -2)));
        $h = $h[0];
        return (is_numeric($h) && is_numeric($m) && $h>0 && $h<13 &&
$m>=0 && $m<60);

See the code in action here http://ideone.com/tSQIb

Shiplu Mokaddim
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