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JavaScript accepts these time zones:
When setting a date, without specifying the time zone, JavaScript will use the browser's time zone. When getting a date, without specifying the time zone, the result is converted to the browser's time zone. In other words: If a date/time is created in GMT (Greenwich Mean Time), the date/time will be converted to CDT (Central US Daylight Time) if a user browses from central US.
https://en.wikipedia.org/wiki/Coordinated_Universal_Time
https://upload.wikimedia.org/wikipedia/commons/e/e8/Standard_World_Time_Zones.png