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Top Forums Shell Programming and Scripting How to configure time zone using POSIX format in Centos 5? Post 302746471 by DGPickett on Wednesday 19th of December 2012 12:15:22 PM
Old 12-19-2012
PERL has an embedded db that might help: cgi - Get time zone abbreviation using POSIX (Perl) - Stack Overflow

The Olson DB escribed: tz database - Wikipedia, the free encyclopedia

Noe GMT-14 is UTC + 14 hours is UTC - 10 hours is, according to the database:
List of tz database time zones - Wikipedia, the free encyclopedia
it is HST, so you would set TZ to HTC-10 or something like that. POSIX offset sign is backward of TZ: GMT/UTC standards reversed in timezone standards (and PHP, and wordpress, and Unix/Posix) | Stef's Blog

Of course, you might be off a day!
Code:
$ ( echo $TZ ; date ; TZ=GMT-14 ; date )
EST5EDT
Wed Dec 19 12:19:32 EST 2012
Thu Dec 20 07:19:32 GMT 2012
$ ( echo $TZ ; date ; TZ=GMT+14 ; date )
EST5EDT
Wed Dec 19 12:20:14 EST 2012
Wed Dec 19 03:20:14 GMT 2012
$ ( echo $TZ ; date ; TZ=GMT14 ; date )
EST5EDT
Wed Dec 19 12:21:18 EST 2012
Wed Dec 19 03:21:18 GMT 2012
$ ( echo $TZ ; date ; TZ=Pacific/Kiritimati ; date )
EST5EDT
Wed Dec 19 12:26:52 EST 2012
Wed Dec 19 17:26:52 Pacific/Kiritimati 2012
$ ( echo $TZ ; date ; TZ=Pacific/Kiritimati-14 ; date )
EST5EDT
Wed Dec 19 12:27:50 EST 2012
Thu Dec 20 07:27:50 Pacific/Kiritimati 2012
$

So, TZ sets the visible name, for which there should be a table of 3 place capital letter codes for every offset, but apparently there is not. Using more than 3 places may work some places.

Last edited by DGPickett; 12-19-2012 at 01:30 PM..
 

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FUNCTION::CTIME(3stap)					      Time utility functions					    FUNCTION::CTIME(3stap)

NAME
function::ctime - Convert seconds since epoch into human readable date/time string SYNOPSIS
ctime:string(epochsecs:long) ARGUMENTS
epochsecs Number of seconds since epoch (as returned by gettimeofday_s) DESCRIPTION
Takes an argument of seconds since the epoch as returned by gettimeofday_s. Returns a string of the form "Wed Jun 30 21:49:08 1993" The string will always be exactly 24 characters. If the time would be unreasonable far in the past (before what can be represented with a 32 bit offset in seconds from the epoch) an error will occur (which can be avoided with try/catch). If the time would be unreasonable far in the future, an error will also occur. Note that the epoch (zero) corresponds to "Thu Jan 1 00:00:00 1970" The earliest full date given by ctime, corresponding to epochsecs -2147483648 is "Fri Dec 13 20:45:52 1901". The latest full date given by ctime, corresponding to epochsecs 2147483647 is "Tue Jan 19 03:14:07 2038". The abbreviations for the days of the week are 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', and 'Sat'. The abbreviations for the months are 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', and 'Dec'. Note that the real C library ctime function puts a newline (' ') character at the end of the string that this function does not. Also note that since the kernel has no concept of timezones, the returned time is always in GMT. SystemTap Tapset Reference June 2014 FUNCTION::CTIME(3stap)
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