Some countries use a Daylight Saving Time (DST):
Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn.
Sometimes there is no 2 am. Sometimes you get 2 am two times. To avoid cron jobs running twice or not at all WP needs the GMT (or more precise: UTC). UNIX time stamps cannot be used because they start in 1970 … and there is still the Year 2038 problem.
If you want to write an imaginary diary of Gaius Julius Caesar or James T. Kirk … you will run into problems with the current system too, but they may be solvable at least. 🙂
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