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What does one need to deal with or know when working with dates and times?

Around the internet I've found a lot of little tricks that slip up programmers when working with dates and times.

Some examples include:

  • Not all timezones are whole numbers
  • The 100/400 rule with regards to leap years
  • dd/mm/yyyy vs mm/dd/yyyy
  • The 2038 problem
  • etc

So what should a programmer dealing with dates and times know? Please keep each piece开发者_Go百科 of information in its own answer.

What issues are involved when dealing with timezones? Differing days around the world. Etc etc etc.

I am not looking for trite answers "using the existing" functions because that answers precisely nothing. It does not tell me what issues are involved when writing a time heavy application (say a calendar)

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