09/02/1942 Daylight-saving "war time" goes into effect in USA
War Time (Daylight Saving Time)
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Why We Have Daylight Saving Time
DST became a local option and was observed in some states until World War II when President Franklin Roosevelt instituted year-round DST, called "War Time". It lasted until the last Sunday in September. After that many states and cities east of the Mississippi River adopted summer DST.
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