Questions about tzdata implementations

Olson, Arthur David (NIH/NCI) [E] olsona at
Tue Mar 30 18:41:45 UTC 2010

> For the general US rules, there is a rule that says DST started in 1945 on
> Aug 14 at 23:00; however, my tests in Java indicate that DST was observed from
> Feb 9 1942 through Sep 30 1945, continuously. The latter matches the historical
> information I've found. Is this rule superfluous?

The U.S. was indeed turning the clock forward one hour continuously from 1942-02 through 1945-09.
Before 1945-08-14 this was called "War" time; after it was called "Peace" time.
The only affect of the 1942 rule in the "northamerica" file is to change the abbreviations being used.


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