On Mar 28, 1:22 pm, <.> wrote:
> Technically windows does not use GMT (working out the time by looking at
> stars etc). It uses UTC which is atomic clocks. The label of the time
> changes with Daylight Saving. Windows does not use the label except in some
> americian time zones. We just changed from AEDT to AEST."pbx" <pbei...@gmail.com> wrote in message
>
> news:1175112743.763933.149210@e65g2000hsc.googlegroups.com...
>
>
>
> > On Mar 28, 10:57 am, "Tom Porterfield" <tppor...@mvps.org> wrote:
> >> pbx wrote:
> >> > Vista seems confused about what GMT is:
>
> >> > my date/time is 3/27/2007 5:14PM in GMT -8 Pacific Time (US & Canada)
>
> >> > if I set the additional clock to both available GMTs:
>
> >> > GMT (Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London)
> >> > and
> >> > GMT (Casablanca, Monrovia, Reykjavik)
>
> >> > the first one (london) says its: 3/28/2007 1:14AM
>
> >> > the second one (casablanca) says its: 3/28/2007 12:14AM
>
> >> > the second one is right!
>
> >> Actually they are both right but you have to understand what you are
> >> seeing.
> >> Pacific Time (GMT-8) is currently in daylight savings time meaning you
> >> are
> >> actually currently GMT-7. True GMT (Greenwich Mean Time) does not have a
> >> concept of daylight savings time so GMT-8 is always GMT-8 even if when
> >> adjusted it is GMT-7. Casablanca is not true GMT and while Casablanca
> >> does
> >> not change its clock for daylight savings time, any conversion from local
> >> time where DST is in effect does need to be accounted for and Windows
> >> does
> >> this automacitally for you. To see the correct time for true Greenwich
> >> Mean
> >> Time you need to set that as your timezone AND disable the automatic
> >> adjustment for daylight savings time.
> >> --
> >> Tom Porterfield- Hide quoted text -
>
> >> - Show quoted text -
>
> > Tom--
>
> > that's a pretty good explanation but...
>
> > are saying that GMT is now +1 in London because London "sprang
> > forward" to summer time.
>
> > but then is:
>
> >http://wwp.greenwichmeantime.com/
>
> > wrong?
>
> > is there no absolute concept of GMT? http://wwp.greenwichmeantime.com/
> > matches the Casablanca setting.
> > Also the .NET Framework 2.0 (DateTime.UtcNow) running on the same
> > Vista machine reports GMT to match the Casablanca setting.
>
> > seems to me that GMT is GMT and London is now +1 GMT... so if the
> > Vista setting was London it would be correct... but it starts off
> > saying that its GMT (or is GMT <> UTC?)
>
> > chime in all (pun intended).- Hide quoted text -
>
> - Show quoted text -
seems to me that GMT should not be shown as a "varying" time based on
daylight savings/summer time, but should always match UTC.
if Microsoft doesn't think this is a bug, then i would suggest that
they add a UTC option to the clocks timezone so those of us who want
to know UTC aka "GMT" can set the clock to it.