# ....
     return -1 if $hours1 < $hours2;
     return 1 if $hours1 > $hours2;
     return -1 if $hours1 == $hours2 && $minutes1 < $minutes2;
     return 1 if $hours1 == $hours2 && $minutes1 > $minutes2;
     return -1 if $hours1 == $hours2 && $minutes1 == $minutes2 && $seconds1 < $seconds2;
     return 1 if $hours1 == $hours2 && $minutes1 == $minutes2 && $seconds1 > $seconds2;