Abbreviation Time zone name Other names Offset ADT Atlantic Daylight Time HAA UTC -3 AKDT Alaska Daylight Time UTC -8 AKST Alaska Standard Time UTC -9 AST Atlantic Standard Time AST, HNA UTC -4 AT Atlantic Time UTC -4:00 / -3:00 CDT Central Daylight Time HAC UTC -5 CST Central Standard Time CST, HNC UTC -6 CT Central Time UTC -6:00 / -5:00 EDT Eastern Daylight Time HAE, EDT UTC -4 EGST Eastern Greenland Summer Time UTC +0 EGT East Greenland Time UTC -1 EST Eastern Standard Time ET, HNE UTC -5 ET Eastern Time UTC -5:00 / -4:00 GMT Greenwich Mean Time UTC +0 HDT Hawaii-Aleutian Daylight Time UTC -9 HST Hawaii Standard Time UTC -10 MDT Mountain Daylight Time HAR UTC -6 MST Mountain Standard Time HNR UTC -7 MT Mountain Time UTC -7:00 / -6:00 NDT Newfoundland Daylight Time HAT UTC -2:30 NST Newfoundland Standard Time HNT UTC -3:30 PDT Pacific Daylight Time HAP UTC -7 PMDT Pierre & Miquelon Daylight Time UTC -2 PMST Pierre & Miquelon Standard Time UTC -3 PST Pacific Standard Time PT, HNP UTC -8 PT Pacific Time UTC -8:00 / -7:00 WGST Western Greenland Summer Time UTC -1 WGT Western Greenland Time UTC -2

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