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Author Topic: Time Displayed  (Read 1136 times)
Keith Taylor
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« on: November 14, 2016, 11:22:21 AM »

 I notice that the time shown in the upper right hand corner still displays daylight saving time. Does the list preferences not account for automatically changing to standard time?

Keith
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Ed Lecuyer
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« Reply #1 on: November 14, 2016, 02:28:13 PM »

Yes, the forum software does not automatically adjust for Daylight Savings Time switching. I made the change so that the time should now appear correctly. Thanks for the reminder.
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Ed Lecuyer
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Dave Buczkowski
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« Reply #2 on: November 14, 2016, 03:16:57 PM »

Mine is still an hour off.
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Tom Casper
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« Reply #3 on: November 14, 2016, 03:35:28 PM »

Ed i think you went the wrong way.  It is an hour earlier for me in central time zone SB an hr later.

Tom C.
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Ed Lecuyer
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« Reply #4 on: November 14, 2016, 03:58:26 PM »

I changed the "time offset" from 1 to 0. This should put us back into standard time.

If your time is not correct, click the "Profile" tab near the top of the page, then on the left, under "Modify Profile" choose "Look and Layout Preferences". Set the time offset to:
Eastern Time: -5
Central Time: -6
Mountain Time: -7
Pacific Time: -8

(These values are the offset from UTC.)

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Ed Lecuyer
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Keith Taylor
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« Reply #5 on: November 14, 2016, 03:58:42 PM »

Yes, the forum software does not automatically adjust for Daylight Savings Time switching. I made the change so that the time should now appear correctly. Thanks for the reminder.
Thanks Ed! And thank you again for all the work you do to maintain this forum!
Keith
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Paul Uhland
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« Reply #6 on: November 14, 2016, 05:34:54 PM »

Why did GMT (Greenwich Mean Time) become "UTC", whatever that means?
~24-zone, worldwide time still depends on the hour at the zero, north-south meridian of longitude running through the Greenwich Naval Observatory in London, was essential to know in my ocean-going Navy days before satellites and other ways of checking time/location were invented.  
« Last Edit: November 14, 2016, 06:09:55 PM by Paul Uhland » Logged

Paul Uhland
Ed Lecuyer
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« Reply #7 on: November 14, 2016, 06:07:10 PM »

Here are good explanations of UTC vs GMT. In practice, they represent the same unit of time.

https://www.timeanddate.com/time/gmt-utc-time.html
http://www.diffen.com/difference/GMT_vs_UTC

In my professional computer world, we use UTC for computing time offsets - this is not just something quirky about the forum.
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Ed Lecuyer
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Philip Marshall
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« Reply #8 on: November 14, 2016, 06:29:08 PM »

GMT is local solar time in Greenwich, so it's an empirical estimate of "true" time that depends on the rotation of the earth. The problem is that the earth wobbles a little bit on its axis, so GMT varies a little tiny bit as a result. That's fine for humans setting their watches (or even marine chronometers), but most modern technology can't deal with that kind of variance. So our computers instead use UTC, which is defined in absolute terms and usually coincides with GMT, except when it doesn't. This helps to prevent the internet from crashing and planes and satellites from falling out of the sky.
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Carl Soderstrom
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« Reply #9 on: November 15, 2016, 06:07:54 AM »

Thanks Ed
Always wondered why postings had no relation to local time.

And what Kieth said
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John Scott
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« Reply #10 on: November 17, 2016, 11:41:59 AM »

Historically, railroads and time distribution are inextricably linked. There is plenty of information available but a couple of useful links are the following:

https://en.wikipedia.org/wiki/Railway_time

http://railroad.lindahall.org/essays/time-standardization.html .

Originally, time was distributed on the railroads by means of the telegraph. That brings to mind the question - "Did the WW&F have the telegraph and, if so, does that form part of the current preservation effort?"
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James Patten
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« Reply #11 on: November 17, 2016, 12:05:23 PM »

No, the WW&F used telephones to talk to different stations on the line.  There were no track-side lines.
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John Scott
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« Reply #12 on: November 17, 2016, 12:11:05 PM »

Thanks, James - I guess that makes things easy, to an extent.
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