TIGHAR

Amelia Earhart Search Forum => Celestial choir => Topic started by: Martin X. Moleski, SJ on January 10, 2012, 08:50:27 AM

Title: Time and Date Calculations
Post by: Martin X. Moleski, SJ on January 10, 2012, 08:50:27 AM

In trying to put together a table of message traffic to and from Lae (http://tighar.org/wiki/Delayed_in_Lae#Message_Traffic), 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 (http://tighar.org/wiki/Timezones).

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

Thanks.

Title: Re: Time and Date Calculations
Post by: Ric Gillespie on January 10, 2012, 09:03:29 AM

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

Title: Re: Time and Date Calculations
Post by: Martin X. Moleski, SJ on January 10, 2012, 10:05:23 AM

Quote from: Ric Gillespie on January 10, 2012, 09:03:29 AM

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

Thanks, Ric!

I think I've reproduced it in a spreadsheet. 

Title: Re: Time and Date Calculations
Post by: Ric Gillespie on January 10, 2012, 11:02:49 AM

Looks good.  Should help.

Title: Re: Time and Date Calculations
Post by: Martin X. Moleski, SJ on January 10, 2012, 12:26:51 PM

Quote from: Ric Gillespie on January 10, 2012, 11:02:49 AM

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 (http://tighar.org/wiki/Timezones#Ric.27s_Cheatsheet), with links to two .pdf versions.

Title: Re: Time and Date Calculations
Post by: Irvine John Donald on January 10, 2012, 12:59:46 PM

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

Title: Re: Time and Date Calculations
Post by: Gary LaPook on January 10, 2012, 06:14:22 PM

Quote from: Martin X. Moleski, SJ on January 10, 2012, 08:50:27 AM

In trying to put together a table of message traffic to and from Lae (http://tighar.org/wiki/Delayed_in_Lae#Message_Traffic), 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 (http://tighar.org/wiki/Timezones).

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 (https://tighar.org/smf/index.php/topic,433.msg5362.html#msg5362).

gl

Title: Re: Time and Date Calculations
Post by: Gary LaPook on January 10, 2012, 06:19:15 PM

Quote from: Martin X. Moleski, SJ on January 10, 2012, 08:50:27 AM

In trying to put together a table of message traffic to and from Lae (http://tighar.org/wiki/Delayed_in_Lae#Message_Traffic), 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 (http://tighar.org/wiki/Timezones).

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

Title: Re: Time and Date Calculations
Post by: Martin X. Moleski, SJ on January 10, 2012, 07:29:10 PM

Quote from: Gary LaPook on January 10, 2012, 06:19:15 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.