I've been programming for 25 years or so.

Hmm dates... It's almost as if you'd want to just count the number of seconds/ms since some point in time. Then you can do arithmetic easily, don't have to worry about calendars, leap years, etc... :/

Converting a date to a human readable form is hard. There is no way on earth that computers should be storing dates in human calendar readable forms. They should only ever be converted to that format for display purposes. That is the lesson MS don't ever seem to learn.