Utility to display time change?

[Neil Edwards]

Hello Experts,

Does anyone know of a utility that displays the next change to/from Daylight Saving Time? I may have to write something that looks at /usr/lib/tztab but I am hoping there is already a command.

TIA,
Neil

[Steven E. Protter]

I think you're writing the utility sir.

You might be able to mess with caldj.sh to get results. It can be found on http://www.hpux.ws/merijn

Every once in a while the government mandates a change in the date of the switch on time change, so I use ntp to keep the servers on track.

SEP

[Elmar P. Kolkman]

grep $(echo $TZ | sed "s|$(date +%Z)[-]*[0-9]*||") /usr/lib/tztab | sort -nk 5 | tail -1

This will give you the month and possible days for the next DST change.

[A. Clay Stephenson · Accepted solution]

Well Neil, as Foghorn Leghorn once said "I always keep my feathers numbered for just such an emergency. Here is a script (actually a fairly recently improved Perl script) from an earlier version I posted that will do just that.

dst.pl -n will display a formatted date/date of the next time change

dst.pl -n -e will display the epoch seconds of the next time change.

dst.pl -d will display the fractional days remaining until the next time change and dst.pl -d -e will display integer days until the next time change.

Invoke as dst.pl -u for full usage.

[A. Clay Stephenson]

Ooops Neil, I forgot to mention that this puppy will also works on Windows if you have on the the free Perls installed.

[Neil Edwards]

Thanks A. Clay. That did just what I needed! I even tried it on my PC and your Perl script worked there too!

Thanks,
Neil