public class TimeConvert
{
   /**
      Converts military time to ordinary time.
      @param milTime, the military time provided: hhmm
      @return a string of the form 9:35 am or 7 pm
   */
   public static String militaryToOrdinaryTime(int milTime)
   {
      if(milTime == 0)
      {
         return "12:00 am";
      }
      if(milTime < 100)
      {
         String min = Integer.toString(milTime);
         if(min.charAt(0) == '0' && min.charAt(1) == '0')
         {
            return "12 am";
         }
         return String.format("12:%c%c am", min.charAt(0), min.charAt(1));
      }
      if(milTime < 1000)
      {
         String time = Integer.toString(milTime);
         if(time.charAt(1) == '0' && time.charAt(2) == '0')
         {
            return String.format("%c am", time.charAt(0));
         }
         return String.format("%c:%c%c am", time.charAt(0), time.charAt(1), time.charAt(2));
      }
      if(milTime < 1200)
      {
         String time = Integer.toString(milTime);
         if(time.charAt(2) == '0' && time.charAt(3) == '0')
         {
            return String.format("%c%c am", time.charAt(0), time.charAt(1));
         }
         return String.format("%c%c:%c%c am", time.charAt(0), time.charAt(1), time.charAt(2), time.charAt(3));
      }
      if(milTime < 2200)
      {
         String time = Integer.toString(milTime - 1200);
         if(time.charAt(1) == '0' && time.charAt(2) == '0')
         {
            return String.format("%c pm", time.charAt(0));
         }
         return String.format("%c:%c%c pm", time.charAt(0), time.charAt(1), time.charAt(2));
      }
      if(milTime < 2400)
      {
         String time = Integer.toString(milTime - 1200);
         if(time.charAt(2) == '0' && time.charAt(3) == '0')
         {
            return String.format("%c%c pm", time.charAt(0), time.charAt(1));
         }
         return String.format("%c%c:%c%c pm", time.charAt(0), time.charAt(1), time.charAt(2), time.charAt(3));
      }
      return null;
   }
}