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>Actually the meaning of a date like: 2018-05-26T13:45:21+02:00 Will never change,

It will respective to the local time though if a state decides to stop honoring DST or changes TZ.



I once ran across a book of changes over time to local time zones, I believe for historical research. It was the size of a phone book.

Ah yes, American Atlas: United States Latitudes, Longitudes, Time Changes and Time Zones 5th Edition by Thomas G. Shanks 448 pages.

Covers probably well over 100K locations each with its own history of timekeeping.




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