Re: Data, Time, and all that.

[Tass Mailing List <tass@mail.alembic.net>]

Date: Sun, 11 Mar 2007 22:49:18 +0100
From: Paul Bartholdi <Paul.Bartholdi@obs.unige.ch>
To: Tass Mailing List <tass@mail.alembic.net>
Subject: Re: Data, Time, and all that.

Dear Tom,

All Unix I know of, including Solaris and Linuxes, keep the internal
time in UTC format, in facts the number of seconds elapsed from 1970
January 1st at 0:0:0.0 . Only the presentation with date, ls etc. is
done in the local civil time, using the timezone info. If you correct
the time zone,  the internal times recorded in "Unix seconds" will
always stay correct and the reading you make now corrected. So I would
not worry, except for the running scripts that use the local time
information, like opening dome etc.  though they should really work in
local solar time...

Best regards,     Paul



On 3/11/07, Tass Mailing List <tass@mail.alembic.net> wrote:
>
> Date: Sun, 11 Mar 2007 09:05:16 -0500
> From: Thomas F. Droege <droege@fastmail.fm>
> To: tass@tass-survey.org
> Subject: Data, Time, and all that.
>
> I ran last night.  Now the question is, how is it time stamped?  My
> fancy watch sprung forward as it should have and now reads the correct
> local time.  My data taking computers which are running on NTP did not.
> My fancy alarm clock which is supposed to set itself from Bolder did not
> spring forward.  I thought it and the wrist watch worked from the same
> source, sigh!
>
> Since the computer time did not change on the data taking computers (I
> just checked one since the others are up in the dome) I assume that the
> times in the data should be OK.  What do you all think?  Rob?  Michael?
> Should we segregate the next two weeks of data until it can somehow be
> checked?
>
> Time is fun.  It is not so easy.
>
> Tom Droege
> --
>   Thomas F. Droege
>   droege@fastmail.fm

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