Jin,
This is how I did it...
$ampm = "";
$hour = "";
$nTime = explode(":", $militaryTime);
$arrayTime = mktime($nTime[0],$nTime[1],$nTime[2],0,0,0);
$hour = $nTime[0];
if($nTime[0] > 12)
$ampm = "PM";
else
$ampm = "AM";
if($nTime[0] > 12)
{
$hour = $nTime[0] - 12;
$hour = "0" . $hour;
}
// this is var set for display purposes.
$time = "$hour:$nTime[1]:$nTime[2] $ampm";
If you have any questions shoot me a note and ill explain. Its pretty straight forward..
Hope that helps
pete