I am trying to display the following select options. It displays a option value of all times during the day in 30 minute increments but I want the value to display the UTC time of that value.

PHP Code:
 $options = array(); $min30=array('00','30');
    foreach (
range(0,23) as $fullhour) {
       
$parthour $fullhour 12 $fullhour 12 $fullhour;
        foreach(
$min30 as $int){
            if(
$fullhour 11){
                echo 
"<option value='UTC TIME HERE'>".$options[$fullhour.".".$int]=$parthour.":".$int." PM</option>";
            }else{
                if(
$fullhour == 0){$parthour='12';}
                echo 
"<option value='UTC TIME HERE'>".$options[$fullhour.".".$int]=$parthour.":".$int." AM</option>" ;
            }
        }
    } 
Can anyone give me any advice?