Clock setup with dual booting

It’s that time of year, when we change to daylight savings time in the USA.  Other parts of the northern hemisphere will change soon.  And folk in the southern hemisphere will be changing back to standard time.

The best way to handle this is to set you computer clock (BIOS clock, CMOS clock) to UTC (coordinated universal time).  Now that WinXP has been retired, the current Windows systems all support UTC with suitable registry entries.

I last posted on this several years ago.

As an administrator, create a new registry entry (assuming that one does not already exist):

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\RealTimeIsUniversal

Set that entry to be a dword, with value 1.

That will tell Windows to use the CMOS clock set to UTC. Of course, you should also configure linux to use UTC. With opensuse, you can use Yast “Date and Time” to set this.

If you were previously using local time, then you might have to reset the system clock to current time after making these changes. But, thereafter, it will take care of itself apart from some clock drift.

In my case, I see that “ntp” was setup during opensuse 13.2 install, so that I don’t have to worry about drift either, except on my wrist watch.

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About Neil Rickert

Retired mathematician and computer scientist who dabbles in cognitive science.

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