public static String formatMinutesSeconds(long duration) {
        return String.format("%d:%02d", minutesOf(duration), secondsInMinuteOf(duration));
    }
Returns a string representing the specified duration in the format {@code m:ss}.

@param duration duration in milliseconds
@return string representation of the duration.
android/third_party/time-duration-picker/src/main/java/mobi/upod/timedurationpicker/TimeDurationUtil.java