convert a 4-digit military time into the standard 12 hour time format

Question

What I\'m trying to do:

I\'m trying to convert a 4-digit military time into the standard 12 hour time format, with a colon and an added PM or AM wit

Answer 1

public static String convert24HourToAmPm(String time) {

    if (time == null)
        return time;

    // Convert time where time is like: 0100, 0200, 0300....2300...
    if (time.length() == 4 && Helper.isInteger(time)) {
        String hour = time.substring(0,2);
        String minutes = time.substring(2,4);
        String meridian = "am";

        if (hour.substring(0,2).equals("00")) {
            hour = "12";
        } else if (hour.substring(0,1).equals("1") || hour.substring(0,1).equals("2")) {
            meridian = "pm";
            Integer militaryHour = Integer.parseInt(hour);
            Integer convertedHour = null;

            if (militaryHour > 12) {
                convertedHour = (militaryHour - 12);

                if (convertedHour < 10)
                    hour = "0" + String.valueOf(convertedHour);
                else
                    hour = String.valueOf(convertedHour);
            }
        }

        time = hour + ":" + minutes + " " + meridian;
    }

    // TODO - Convert time where time is like 01:00...23:00...

    return time;
}