2009/4/6 Matthew Saltzman <mjs@xxxxxxxxxxx>: > On Mon, 2009-04-06 at 09:56 -0700, Kam Leo wrote: >> On Mon, Apr 6, 2009 at 9:17 AM, suvayu ali <fatkasuvayu+linux@xxxxxxxxx> wrote: >> > >> > I have a strong hunch booting to XP after the DST change caused this >> > mismatch. What is the recommended way of maintaining the system time >> > for dual boot machines? >> >> When you use a dual/multi-boot system you need to disable one or more >> of your systems from automatically updating for daylight savings. This >> goes whether you are booting multiple versions of Windows or a mixture >> of Windows and Linux. > > Linux in UTC will always show the correct time (as long as the hardware > clock is correct UTC), whether on or off at the transition. > > Linux in local time will *not* make adjustments for DST if it is not > running when the transition occurs, but it will adjust if it is running > at that time. > > Windows will adjust if it is running or the first time it is turned on > after the change, no matter what. > > So you can see that there are various kinds of trouble you can get into > if you try to use local time on a dual-boot machine, depending on which, > if any, system is running at the transition time. > > I don't use Windows that much, so I keep the hardware clock in UTC, > Linux running ntpd, Windows in time zone GMT with DST adjustments turned > off (which has to be done for all Windows users separately). Then the > machine shows the correct local time in Linux, but it shows UTC in > Windows. > > I've heard that there is a Windows registry entry that allows one to > keep the hardware clock in UTC on Windows, but I've also heard that it > can break things. > >> >> The other issue is that you need to patch your Windows software. >> Daylight savings began last month. > > The other thing that makes this hard is that DST starts on different > dates in different countries, and countries keep changing things... > -- > Matthew Saltzman Thanks Matthew for this clear explanation. I am going to set the hardware clock to UTC and set Windows to use UTC without DST corrections to avoid further confusion. This seems like the most sure-shot way to tackle the problem. Thanks to all who replied. :) -- Suvayu Open source is the future. It sets us free. -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
