I was on a recent trans-Pacific flight where they announced after landing that one of the flight attendants had completely skipped over her birthday (we crossed the IDL at about midnight) so we gave her a round of applause for sacrificing her birthday in the name of duty.

I cross the IDL semi-frequently and it always depresses me. It depresses me when I completely skip a day going west, and it depresses me when I fly back the other way and have to live through the same day twice.