10 More Discussions You Might Find Interesting
1. Solaris
Hello all,
I just want to update the timezone file with new file to update the time, so the zone in /etc/TIMEZONE will be the same but the file it refers to will be changed, and the local time should be changed, can this take effect without rebooting Solaris 10? (9 Replies)
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2. Red Hat
Hi all,
I faced with some problem when I changing java timezone on RHEL 5. I used tzupdater.jar tool from oracle to update java timezone. But I missed stopping applications before I run tzupdater tool. So some applications working with wrong timezone.
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3. Solaris
Hello everyone,
Can you please help me with this problem?
I want to change the timezone of my Solaris 10 system. I found on internet that I should do the following steps:
1- Edit the /etc/TIMEZONE file
2- restart the system : init 6
My question is : In the file /etc/TIMEZONE I should... (5 Replies)
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5. Shell Programming and Scripting
Hi,
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6. Shell Programming and Scripting
I have written a csh script that changes the name of file from src to dst.
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TESTAmvfiles
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7. Red Hat
Please i need help in how to add/remove rules in timezone files under /usr/share/zoneinfo/ , cause i have tried many times to do this by adding rules in an time zone file then compile this file with zic tool and then link it to /etc/localtime but always the output doesn't match what i have made... (0 Replies)
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8. Red Hat
Hi,
I would like to change time zone Linux from IST to US/Canada but not getting the option , I have run the command setup -> timezone configuration but not getting the option of us/canada or pacific us/canada.
Please suggest.
Regards,
Manoj (1 Reply)
Discussion started by: manoj.solaris
1 Replies
9. Shell Programming and Scripting
Hi everybody,
I have a task on my hands, the goal of the task is to overwrite the time zone information for the linux OS, I have searched and found that the this data is stored in the file /etc/localtime, the thing I want to ask about is the structure of the file as described in the tzfile manual... (3 Replies)
Discussion started by: modn3
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10. UNIX for Advanced & Expert Users
I've date back one of my Unix WS ,after that again i want to return to real date,but after running:
# date -u mmddHHMMyy
the clock immediately returns to GMT timezone that is different with my local timezone.
any suggestion could be useful...
tanx
--nikk (2 Replies)
Discussion started by: nikk
2 Replies
TZSET(3) Linux Programmer's Manual TZSET(3)
NAME
tzset, tzname, timezone, daylight - initialize time conversion information
SYNOPSIS
#include <time.h>
void tzset (void);
extern char *tzname[2];
extern long timezone;
extern int daylight;
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
tzset(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
tzname: _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
timezone: _SVID_SOURCE || _XOPEN_SOURCE
daylight: _SVID_SOURCE || _XOPEN_SOURCE
DESCRIPTION
The tzset() function initializes the tzname variable from the TZ environment variable. This function is automatically called by the other
time conversion functions that depend on the timezone. In a System-V-like environment, it will also set the variables timezone (seconds
West of UTC) and daylight (to 0 if this timezone does not have any daylight saving time rules, or to nonzero if there is a time during the
year when daylight saving time applies).
If the TZ variable does not appear in the environment, the tzname variable is initialized with the best approximation of local wall clock
time, as specified by the tzfile(5)-format file localtime found in the system timezone directory (see below). (One also often sees
/etc/localtime used here, a symlink to the right file in the system timezone directory.)
If the TZ variable does appear in the environment but its value is empty or its value cannot be interpreted using any of the formats speci-
fied below, Coordinated Universal Time (UTC) is used.
The value of TZ can be one of three formats. The first format is used when there is no daylight saving time in the local timezone:
std offset
The std string specifies the name of the timezone and must be three or more alphabetic characters. The offset string immediately follows
std and specifies the time value to be added to the local time to get Coordinated Universal Time (UTC). The offset is positive if the
local timezone is west of the Prime Meridian and negative if it is east. The hour must be between 0 and 24, and the minutes and seconds 0
and 59.
The second format is used when there is daylight saving time:
std offset dst [offset],start[/time],end[/time]
There are no spaces in the specification. The initial std and offset specify the standard timezone, as described above. The dst string
and offset specify the name and offset for the corresponding daylight saving timezone. If the offset is omitted, it default to one hour
ahead of standard time.
The start field specifies when daylight saving time goes into effect and the end field specifies when the change is made back to standard
time. These fields may have the following formats:
Jn This specifies the Julian day with n between 1 and 365. Leap days are not counted. In this format, February 29 can't be repre-
sented; February 28 is day 59, and March 1 is always day 60.
n This specifies the zero-based Julian day with n between 0 and 365. February 29 is counted in leap years.
Mm.w.d This specifies day d (0 <= d <= 6) of week w (1 <= w <= 5) of month m (1 <= m <= 12). Week 1 is the first week in which day d
occurs and week 5 is the last week in which day d occurs. Day 0 is a Sunday.
The time fields specify when, in the local time currently in effect, the change to the other time occurs. If omitted, the default is
02:00:00.
Here is an example for New Zealand, where the standard time (NZST) is 12 hours ahead of UTC, and daylight saving time (NZDT), 13 hours
ahead of UTC, runs from the first Sunday in October to the third Sunday in March, and the changeovers happen at the default time of
02:00:00:
TZ="NZST-12:00:00NZDT-13:00:00,M10.1.0,M3.3.0"
The third format specifies that the timezone information should be read from a file:
:[filespec]
If the file specification filespec is omitted, the timezone information is read from the file localtime in the system timezone directory,
which nowadays usually is /usr/share/zoneinfo. This file is in tzfile(5) format. If filespec is given, it specifies another
tzfile(5)-format file to read the timezone information from. If filespec does not begin with a '/', the file specification is relative to
the system timezone directory.
Here's an example, once more for New Zealand:
TZ=":Pacific/Auckland"
FILES
The system timezone directory used depends on the (g)libc version. Libc4 and libc5 use /usr/lib/zoneinfo, and, since libc-5.4.6, when this
doesn't work, will try /usr/share/zoneinfo. Glibc2 will use the environment variable TZDIR, when that exists. Its default depends on how
it was installed, but normally is /usr/share/zoneinfo.
This timezone directory contains the files
localtime local timezone file
posixrules rules for POSIX-style TZ's
Often /etc/localtime is a symlink to the file localtime or to the correct timezone file in the system timezone directory.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD.
NOTES
Note that the variable daylight does not indicate that daylight saving time applies right now. It used to give the number of some algo-
rithm (see the variable tz_dsttime in gettimeofday(2)). It has been obsolete for many years but is required by SUSv2.
4.3BSD had a function char *timezone(zone, dst) that returned the name of the timezone corresponding to its first argument (minutes West of
UTC). If the second argument was 0, the standard name was used, otherwise the daylight saving time version.
SEE ALSO
date(1), gettimeofday(2), time(2), ctime(3), getenv(3), tzfile(5)
COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2012-03-25 TZSET(3)