As you see below, I changed the Windows clock time-zone from UTC +3:30 Tehran to UTC +1:00 Windhoek. As 3:30 - 1:00 = 2.30, I expect the time to change -2:30, But it change -1.30 :

Before :

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After :

enter image description here

Note that it works fine for other UTC +1:00 countries. I have this problem for Windhoek only.


TimeandDate.com shows Windhoek is not in the time zone you think it is. It is on West African Summer Time, which is UTC+2. Wikipedia agrees.

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  • So why it is written in the Windows time-zone UTC +1 Windhoek? Shouldn't it be UTC +2 Windhoek? – Jean Mar 18 '15 at 6:54
  • 1
    Because West African Time is at UTC+1, @Jean. Only now, it's summer time there, but that's not reflected in the list in Windows. (And it would not make sense to show the offsets with local daylight saving time applied, as nominally Windhoek still is in UTC+1.) – slhck Mar 18 '15 at 7:09

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