Re: [guide-user] DST fix posted

P. Clay Sherrod Mar 12, 2009

You are correct in that something is affecting other time-dependent functions; many of my
IR weather inputs for the observatories are one hour off as well....learned that this
morning.

Thanks as always for the attention to this Bill.....I may wait until Sunday and see what
happens.

Dr. Clay
_____
Arkansas Sky Observatories
MPC H45 - Petit Jean Mountain South
MPC H41 - Petit Jean Mountain
MPC H43 - Conway West
http://www.arksky.org/

----- Original Message -----
From: "Bill J Gray" <pluto@...>
To: <guide-user@yahoogroups.com>
Sent: Thursday, March 12, 2009 10:11 AM
Subject: [guide-user] DST fix posted


> Hi folks,
>
> I've posted a fix for the DST problem, at
>
> http://www.projectpluto.com/new.htm
>
> HOWEVER, be advised that if you wait until Sunday,
> the problem will go away. Turns out there's a problem
> with certain versions of the Microsoft C runtime library:
> if DST begins in a month that starts on Sunday, it waits
> a week before instituting the DST changeover. Hence,
> according to Microsoft, DST will not occur until 15 March,
> not 8 March. (And yes, I'm ready for the inevitable
> "beware the ides of March!" comments.)
>
> The bug affects certain time functions, but not all.
> That's why I found myself staring in bemusement at some test
> code I wrote, which showed that different time functions
> in the Microsoft library were returning different times.
> Fortunately, Bill Appelbaum e-mailed me about this, and
> described the problem. He adds: "We haven't had a March
> or November starting on Sunday since 1998, so the bug hasn't
> manifested itself until now."
>
> March and November always start on the same day of the
> week, so if you face the problem in March, you'll have it
> again in November.
>
> Many thanks to all who replied on this issue. I've had
> several reasons to curse DST over the years. Guess I can
> add this to the list.
>
> -- Bill
>
>
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