My clock shows wrong time for GMT!

Wrong GMT

My local time is correct (Tehran, IRAN = GMT +3:30), but as it's clear from the above screenshot, GMT (Greenwich) is 1 hour behind according to Google!

The UTC and Pacific times are correct (checked with Google).

Note that "Time & Date" settings are set to "Automatically from the Internet".

Any ideas to fix this?

  • 2
    Are you taking into account that the local time in Greenwich will currently be BST (British Summer Time), which is 1hr ahead of GMT? Sep 9, 2014 at 12:06
  • 2
    It's not clear what the entry "Greenwich" means, under the callender - it could be GMT, or current time at Greenwich, which would be BST. Sep 9, 2014 at 12:10
  • @steeldriver To add new locations in the "Time & Date" settings, you just type the name of the location, then select the desired item from the popup list. And there is only one "Greenwich, UK" in the list. Sep 9, 2014 at 12:15
  • can you type "date ; date -u" in a terminal and show the results ?
    – Archemar
    Sep 9, 2014 at 12:21
  • @Archemar Here is the output: Tue Sep 9 16:52:16 IRDT 2014 Tue Sep 9 12:22:16 UTC 2014 Sep 9, 2014 at 12:22

1 Answer 1


Use UTC instead of GMT

The time entry "Greenwich" under the calender is confusing.

One could obviously think of GMT - Greenwich Mean Time, which is used very often.

But it could also be just the plain current time at the location Greenwich. That would be BST - British Summer Time.

The entry UTC is less ambiguous - and comparing at that entry, "Greenwich" can only be Greenwich local time, as GMT and UTC are the same, roughly.

GMT is not available as time zone at all. UTC should be used instead. That makes sense because GMT does not have a precise definition, which UTC does have.

  • Well there is no entry for "GMT" in the "Time & Date" list. There is only one "Greenwich, UK" which I selected, assuming that it's GMT. If this is not GMT, then how can I have a GMT entry? Sep 9, 2014 at 12:18
  • See my edit - it's UTC; It's pretty complicated why there are both, really. Sep 9, 2014 at 12:21
  • Oh! So the point is UTC == GMT ... And that's why there's no GMT in the list! I guess my problem is solved. The solution is: Just look at UTC and forget about Greenwich ;) Sep 9, 2014 at 12:27
  • Yes, UTC == GMT - except that it's not allways really clear what GMT is, and UTC is absolutely clear. Sep 9, 2014 at 12:32

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