How to configure time zone using POSIX format in Centos 5? Post: 302746471

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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

12-19-2012

Registered User

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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LEARN ABOUT SUNOS

zdump

zdump(1M)						  System Administration Commands						 zdump(1M)

NAME

       zdump - time zone dumper

SYNOPSIS

       zdump [-v] [-c cutoffyear] [zonename...]

DESCRIPTION

       The  zdump  command  prints the current time for each time zone (zonename) listed on the command line.  Specify zonename as the name of the
       time zone database file relative to /usr/share/lib/zoneinfo.

       Specifying an invalid time zone (zonename) to  zdump does not return an error,  rather  zdump uses GMT. This is consistent with the  behav-
       ior of the library calls; zdump reflects the same behavior of the time routines in libc. See  ctime(3C) and mktime(3C).

OPTIONS

       The following options are supported:

       -v	       Displays  the  entire  contents	of  the  time zone database file for zonename. Prints the time at the lowest possible time
		       value; the time one day after the lowest possible time value; the times both one second before and exactly at each time	at
		       which  the rules for computing local time change; the time at the highest possible time value; and the time at one day less
		       than the highest possible time value. See  mktime(3C) and  ctime(3C) for information regarding time  value  (time_t).  Each
		       line of output ends with isdst=1 if the given time is Daylight Saving Time, or isdst=0 otherwise.

       -c cutoffyear   Cuts off the verbose output near the start of the year cutoffyear.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       1	An error occurred.

FILES

       /usr/share/lib/zoneinfo	       Standard zone information directory

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       zic(1M), ctime(3C), mktime(3C), attributes(5), environ(5)

SunOS 5.10							    19 May 1997 							 zdump(1M)

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