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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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GMDATE(3)								 1								 GMDATE(3)

gmdate - Format a GMT/UTC date/time

SYNOPSIS
string gmdate (string $format, [int $timestamp = time()]) DESCRIPTION
Identical to the date(3) function except that the time returned is Greenwich Mean Time (GMT). PARAMETERS
o $format - The format of the outputted date string. See the formatting options for the date(3) function. o $timestamp - The optional $timestamp parameter is an integer Unix timestamp that defaults to the current local time if a $timestamp is not given. In other words, it defaults to the value of time(3). RETURN VALUES
Returns a formatted date string. If a non-numeric value is used for $timestamp, FALSE is returned and an E_WARNING level error is emitted. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | The valid range of a timestamp is typically from | | | Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 | | | 03:14:07 GMT. (These are the dates that corre- | | | spond to the minimum and maximum values for a | | | 32-bit signed integer). However, before PHP 5.1.0 | | | this range was limited from 01-01-1970 to | | | 19-01-2038 on some systems (e.g. Windows). | | | | | 5.1.1 | | | | | | | There are useful constants of standard date/time | | | formats that can be used to specify the $format | | | parameter. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 gmdate(3) example When run in Finland (GMT +0200), the first line below prints "Jan 01 1998 00:00:00", while the second prints "Dec 31 1997 22:00:00". <?php echo date("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); echo gmdate("M d Y H:i:s", mktime(0, 0, 0, 1, 1, 1998)); ?> SEE ALSO
date(3), mktime(3), gmmktime(3), strftime(3). PHP Documentation Group GMDATE(3)
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