GMT Offset Calculator
What is a zone's offset from GMT?
The offset in GMT terms, with the caveat this whole category turns on: GMT and UTC agree, but 'GMT' as a clock label in Britain does not agree with either for half the year.
Questions people ask
The things that come up about gmt offset calculators, answered plainly.
Is a GMT offset the same as a UTC offset?
Numerically, yes — GMT and UTC never differ by more than a second, so GMT+5 and UTC+5 name the same offset. The confusion is in what people mean by GMT: a zone name, or a reference scale.
What are the Etc/GMT zones for?
Fixed offsets with no daylight saving. Their signs are inverted by POSIX convention — Etc/GMT+5 is five hours behind UTC, not ahead — which is a genuine trap, and a good reason to use a real zone name instead.
Related tools
Convert between zones, watch a board of cities, and find the hour that suits everyone.
UTC Offset CalculatorThe current offset for any zone, in `+05:30` form and in minutes, with the standard and summer offsets and the dates it switches between them.
GMT ConverterGMT to local and back, with the distinction from UTC spelled out — and a warning for the British summer, when a clock labelled GMT is actually an hour ahead of it.
Time Zone DifferenceThe gap between two zones right now, and on any date you pick — because it changes across the year, and the two zones rarely change on the same day.
Time Zone LookupSearch the full zone list, and see what one actually does: its current offset, its standard and summer offsets, its abbreviations and its next several transitions.