Anyone working with dates and times was cursed in a past life. Timezones are a pain to work with. Daylight savings sucks. Some countries change daylight savings at different times. Some countries change timezones sometimes. Go further back and some countries had their own leap days. Different calendars don't form neat cycles and must be manually synchronized every few years. Did you know Easter, for about 300 years, needed to be announced by the Pope each year because it was a lunar holiday based on a Jewish calendar but the Christians followed a different one? Also, every now and again we throw a leap second into the computers because the Earth's rotation is gradually slowing down and 365/366 days isn't quite precise enough anyways.