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Author Topic: Time and Date Calculations  (Read 13801 times)

Martin X. Moleski, SJ

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Time and Date Calculations
« on: January 10, 2012, 08:50:27 AM »

In trying to put together a table of message traffic to and from Lae, I've discovered that I cannot reliably calculate times and dates in my head.

I've tried to assemble some information about timezones in an article on the wiki.

I would appreciate some feedback about whether my description of the issues involved and whether my derived tables are correct.

Thanks.
LTM,

           Marty
           TIGHAR #2359A
 
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Ric Gillespie

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Re: Time and Date Calculations
« Reply #1 on: January 10, 2012, 09:03:29 AM »

This is a cheat-sheet I've used for years.

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Martin X. Moleski, SJ

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Re: Time and Date Calculations
« Reply #2 on: January 10, 2012, 10:05:23 AM »

This is a cheat-sheet I've used for years.

Thanks, Ric!

I think I've reproduced it in a spreadsheet. 
LTM,

           Marty
           TIGHAR #2359A
 
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Ric Gillespie

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Re: Time and Date Calculations
« Reply #3 on: January 10, 2012, 11:02:49 AM »

Looks good.  Should help.
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Martin X. Moleski, SJ

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Re: Time and Date Calculations
« Reply #4 on: January 10, 2012, 12:26:51 PM »

Looks good.  Should help.

It's a lot safer than me doing time operations in my head.  :-\

I've done a wiki table of the same, with links to two .pdf versions.
LTM,

           Marty
           TIGHAR #2359A
 
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Irvine John Donald

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Re: Time and Date Calculations
« Reply #5 on: January 10, 2012, 12:59:46 PM »

Thank You Marty and Ric.  That's much easier to work with.
Respectfully Submitted;

Irv
 
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Gary LaPook

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Re: Time and Date Calculations
« Reply #6 on: January 10, 2012, 06:14:22 PM »

In trying to put together a table of message traffic to and from Lae, I've discovered that I cannot reliably calculate times and dates in my head.

I've tried to assemble some information about timezones in an article on the wiki.

I would appreciate some feedback about whether my description of the issues involved and whether my derived tables are correct.

Thanks.
Also take a look at my old post here.

gl
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Gary LaPook

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Re: Time and Date Calculations
« Reply #7 on: January 10, 2012, 06:19:15 PM »

In trying to put together a table of message traffic to and from Lae, I've discovered that I cannot reliably calculate times and dates in my head.

I've tried to assemble some information about timezones in an article on the wiki.

I would appreciate some feedback about whether my description of the issues involved and whether my derived tables are correct.

Thanks.
The sign convention is that used by navigators and the Navy since they are interested in finding GMT, also known as GCT, UTC and Z (Zulu time), starting from the local time shown on the onboard clocks.

gl
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Martin X. Moleski, SJ

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Re: Time and Date Calculations
« Reply #8 on: January 10, 2012, 07:29:10 PM »

The sign convention is that used by navigators and the Navy since they are interested in finding GMT, also known as GCT, UTC and Z (Zulu time), starting from the local time shown on the onboard clocks.

Thanks--that explains it! I've added a footnote.

LTM,

           Marty
           TIGHAR #2359A
 
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