How to configure time zone using POSIX format in Centos 5?
I was in process of developing a new script to configure a time zone. After some study I got the unix utility /usr/bin/tzselect to get the user inputs. Now I am able to configure the time zone depending on the user inputs except for the POSIX format.
Code:
root >/usr/bin/tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent or ocean.
1) Africa
2) Americas
3) Antarctica
4) Arctic Ocean
5) Asia
6) Atlantic Ocean
7) Australia
8) Europe
9) Indian Ocean
10) Pacific Ocean
11) none - I want to specify the time zone using the Posix TZ format.
#? 2
Please select a country.
1) Anguilla 27) Honduras
2) Antigua & Barbuda 28) Jamaica
3) Argentina 29) Martinique
4) Aruba 30) Mexico
5) Bahamas 31) Montserrat
6) Barbados 32) Netherlands Antilles
7) Belize 33) Nicaragua
8) Bolivia 34) Panama
9) Brazil 35) Paraguay
10) Canada 36) Peru
11) Cayman Islands 37) Puerto Rico
12) Chile 38) St Barthelemy
13) Colombia 39) St Kitts & Nevis
14) Costa Rica 40) St Lucia
15) Cuba 41) St Martin (French part)
16) Dominica 42) St Pierre & Miquelon
17) Dominican Republic 43) St Vincent
18) Ecuador 44) Suriname
19) El Salvador 45) Trinidad & Tobago
20) French Guiana 46) Turks & Caicos Is
21) Greenland 47) United States
22) Grenada 48) Uruguay
23) Guadeloupe 49) Venezuela
24) Guatemala 50) Virgin Islands (UK)
25) Guyana 51) Virgin Islands (US)
26) Haiti
#? 2
The following information has been given:
Antigua & Barbuda
Therefore TZ='America/Antigua' will be used.
Local time is now: Wed Nov 28 04:00:31 AST 2012.
Universal Time is now: Wed Nov 28 08:00:31 UTC 2012.
Is the above information OK?
1) Yes
2) No
#? y
Please enter 1 for Yes, or 2 for No.
#? 1
You can make this change permanent for yourself by appending the line
TZ='America/Antigua'; export TZ
to the file '.profile' in your home directory; then log out and log in again.
Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
America/Antigua
root >
This utility /usr/bin/tzselect provide an option to give a POSIX time format. Suppose if a user provide the posix format as GMT-14 then how do I configure the time zone? I am using Centos 5.
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Discussion started by: sparcman
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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)