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Last tested: Dec 18, 2018
The timezone rules for the specified timezone will be followed. This can sometimes introduce subtle logic bugs. For example, the timezone code `ESTEDT` follows the rules of daylight savings for the Eastern Time Zone of the United States.
The timezone code `America/New_York` is identical to `ESTEDT` for all dates after the Uniform Time Act of 1966. But prior to 1966 `ESTEDT` is EST only while `America/New_York` follows the daylight savings time rules as observed in NYC.