[comp.sys.att] Its that time of year!

dlm@cuuxb.ATT.COM (Dennis L. Mumaugh) (03/30/89)

This is the time of year that Congress in its infinite wisdom had
decided to change the clock.  In the past the change to Daylight
Savings Time was done on the last Sunday of April, but recently
it is done on the FIRST Sunday in April.

Some of the older versions of UNIX System V are unaware of this.
Specifically, any thing earlier than System V Release 3.1 and/or
C Issue 4.1 are not aware of the new time change rules.

Those having earlier releases of UNIX will have to perform a work
around for the next three weeks.

If you do not already have a file /etc/TIMEZONE create one with
the entry below.  Then add the following to all /etc/*rc scripts
and /etc/profile at the beginning of the script:
	. /etc/TIMEZONE

As soon as convenient after the time change edit your
/etc/TIMEZONE file as an example:

Old:
	TZ=CST6CDT
	export TZ
New:
	TZ=CDT5
	export TZ

That is, delete the daylight part of the line and change the GMT
offset by adding one.

There are parts of North America such as Arizona, parts of
Indiana and Canada that do not observe DST at all.

Also, you are warned that cron has problems with the time change.
WE recommend that one kills cron (kill -15) and restarts cron
AFTER making the above change.  Any cron job scheduled around
that time may be run twice!
-- 
=Dennis L. Mumaugh
 Tier IV UNIX Software Support
 Lisle, IL  ...!{att,lll-crg,attunix}!cuuxb!dlm  OR dlm@cuuxb.att.com

mvadh@cbnews.ATT.COM (andrew.d.hay) (03/30/89)

In article <2666@cuuxb.ATT.COM> dlm@cuuxb.att.com (Dennis L. Mumaugh) writes:
[]
"Also, you are warned that cron has problems with the time change.
"WE recommend that one kills cron (kill -15) and restarts cron
"AFTER making the above change.  Any cron job scheduled around
"that time may be run twice!


not true, in the spring;
jobs scheduled for the hour following your TZ fixer will be SKIPPED.
you do run over the same hour twice in the fall ---
i have my TZ fixer sleep for an hour so IT won't be run twice.
-- 
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