Whoever invented timezones has a special place reserved in developer hell. Nothing breaks your soul quite like debugging why your app works perfectly in California but crashes in Tokyo at exactly 3PM.
I've spent entire sprints fixing date-related bugs only to have some PM go "but what about daylight savings?" and watch my will to live evaporate. If I could time travel, I wouldn't kill Hitler - I'd find the timezone inventor and show them my git blame history.