epoch1970;585605 Wrote: > AFAIK, hwclock cannot not know by reading the clock device. It tries to > read /etc/adjtime to see if there is info about the hardware TZ. If > there is no info, it picks UTC. Have a look at man hwclock for the > authoritative information. > This is what my machine says at 7:51 PM local time. The hw clock is > indeed set to UTC:> Code: -------------------- > > $ more /etc/adjtime ; sudo hwclock --debug --show > 51.263680 1286531652 0.000000 > 1286531652 > UTC > hwclock from util-linux-ng 2.17.2 > Using /dev interface to clock. > Last drift adjustment done at 1286531652 seconds after 1969 > Last calibration done at 1286531652 seconds after 1969 > Hardware clock is on UTC time > Assuming hardware clock is kept in UTC time. > Waiting for clock tick... > ...got clock tick > Time read from Hardware Clock: 2010/10/28 17:51:28 > Hw clock time : 2010/10/28 17:51:28 = 1288288288 seconds since 1969 > Thu 28 Oct 2010 07:51:28 PM CEST -1.021738 seconds -------------------- > > > You only need setting the hw clock to local time when using Windows > (up to XP, at least): it forces the clock to local time if it isn't. > Confusion ensues if you are dual-booting windows/linux. > > BTW in Europe, oct-31 is the switch date from summer time to winter > time (3 AM becomes 2 AM.) Watch out for morning alarms :) Actually, SrvrPowerCtrl adjusts for what I've always considered to be a SBS bug: no anticipation of local time change due to ST=>WT switch in the GetNextAlarm code. So, on those days that SrvrPowerCtrl detects a ST=>WT switch, it advances the wakeup time for the server by an hour (and vice versa in the spring). When the server wakes up, the OS makes the TZ adjustment to local time and SBS's alarm ought to go off at the "right" time.
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