Use DateTimeUtil::time(MyDate);
Retrieves the number of seconds that have elapsed since midnight as a timeOfDay value from the specified utcdatetime value.
TimeOfDay secondsElapsed = DateTimeUtil::time(MyDate);
info(time2str(secondsElapsed, TimeSeparator::Auto, TimeFormat::Auto));
info(time2StrHM(secondsElapsed));
info(time2StrHMLeadingZero(secondsElapsed));
info(time2StrHMS(secondsElapsed))