DST Change For Australia Post: 302116627

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Top Forums Shell Programming and Scripting DST Change For Australia Post 302116627 by jim mcnamara on Monday 7th of May 2007 07:39:23 AM

05-07-2007

Registered User

/usr/share/lib/zoneinfo/Australia/<timezone name>

Can you find a NSW file in the zoneinfo directory? It sounds like it is not there. Or maybe it has some issues, possibly protection.

Plus, DO NOT set time back and forth like that, you can cause cron jobs to do unexpected things. And mess up nightly processing.

UNIX time is kept in seconds since Jan 1 1970. Daylight time changes do not change that count. Changing the date does. The system uses files in /usr/share/lib/zoneinfo/Australia/.... to display the time based on UTC calculated from the number of seconds.

You should set the date (in seconds) to match UTC, whatever that may be.
However use date -a to do that, it is less likely to screw up batch jobs.

You can manually set the timezone using the results of tzselect. It asks questions. tzdump should let you see what /usr/share/lib/zoneinfo/Australia/NSW thinks about DST, if the file is okay.

Last edited by jim mcnamara; 05-07-2007 at 09:01 AM..

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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)