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<== Date ==> <== Thread ==>

Subject: Re: Daylight Savings Time
From: Ralph.Lange@mail.bessy.de
To: Robert Willson <willson@pacific.mps.ohio-state.edu>
Cc: EPICS Tech-Talk <tech-talk@aps.anl.gov>
Date: Mon, 10 Apr 2000 12:18:00 +0200 (METDST)
  > I noticed that my IOC's timestamp does not recognize DST, even though in
  > my resource.def file I select a host that has the correct time.  Is there
  > another modification I must make in order to correct this?

With all reasonable time(stamp) systems timezones and daylight saving
time are entirely a matter of _displaying_ the time(stamp). So your IOC
timestamps are always absolute UT, the IOC doesn't know anything about
your timezone or DST issues.

If your host environment defines reasonable values for TZ and
EPICS_TS_MIN_WEST, your CA client should display correct timestamps.

If you want the EPICS base supplied "date" command on your IOC to work
correctly, you will have to set the EPICS_TS_MIN_WEST and TIMEZONE
environment variables from your startup script (this is my central
Europe example):

putenv "TIMEZONE=MET::-60:032602:102902"
putenv "EPICS_TS_MIN_WEST=-60"

Hope this helps,
Ralph


References:
Re: Compiling extensions Albert Kagarmanov
Daylight Savings Time Robert Willson

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