php - Strtotime Function -

i made script put date informations: day, month, year , hour , minutes , format or pm. take informations with:

$day = $_post['day']

..........

that's how take informations , works well, when wanna do:

$time = strtotime($hour.':'.$minute.' '.$format.' '.$year.'-'.$month.'-'.$day);

it updates database utc 1970, actualy first second ever count.

what wrong?

the h:i y-m-d is not acceptable format strtotime(). need use y-m-d h:i a.

$time = strtotime($year.'-'.$month.'-'.$day.' '.$hour.':'.$minute.' '.$format);