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Article #558

Re: Clock base (was Re: Class project and question)

#558
From: D89.JOHNNY... Johnny Billquist
Date: Sun, 24 Dec 1989 23:46
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> Question:  anyone know why the VMS system has a clock that starts about
> November 15 in the late 1800's?

Sure, that's when we converted to the Gregorian time table (I think
that was his name).

I believe that that was the time when we last had to fiddle
with the time, to keep it up with reality, so you can not
compute days and such stuff correctly before that time.
Actually I think it was only one hour that got lost in that
tweaking.

Most systems don't bother with times so long ago, but VMS
actually keeps track of how many tenths of microseconds that
has passed since that time. It is really quite a neat way
of keeping time, since the Clock routines just has to increment
one word all the time. However, making the conversion
routines to get the right date is a bit worse... I guess
that's why many software designers decide to do it another way.
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References: <1534@speedy.mcnc.org>

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From: D89.JOHNNY...@AIDA.CSD.UU.SE (Johnny Billquist)
Newsgroups: alt.folklore.computers
Subject: Re: Clock base (was Re: Class project and question)
Message-ID: <12552763069016@AIDA.CSD.UU.SE>
Date: 24 Dec 89 23:46:59 GMT
References: <1534@speedy.mcnc.org>
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Posted: Mon Dec 25 00:46:59 1989
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