I showed up for a redeye flight at HNL heading for my first job in Houston after graduating college. I assumed the 11:30pm flight always left at 11:30pm. Thought it was strange there was nobody in the check-in lobby when I got there (for the flight that left at 10:30 due to dumb daylight savings time change on mainland). This was before pre-board security times, so one could show up at airport 30 minutes prior to departure. I'm smarter now that I've learned about DST.