After patching all of my Solaris systems I poked around trying to find a
method to show what the current settings are. Eventually I
found this:

zdump -v PST8PDT | grep 2007
PST8PDT Wed Mar 7 16:46:24 2007 UTC = Wed Mar 7 08:46:24 2007 PST isdst=0
PST8PDT Sun Mar 11 09:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 PST isdst=0
PST8PDT Sun Mar 11 10:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 PDT isdst=1
PST8PDT Sun Nov 4 08:59:59 2007 UTC = Sun Nov 4 01:59:59 2007 PDT isdst=1
PST8PDT Sun Nov 4 09:00:00 2007 UTC = Sun Nov 4 01:00:00 2007 PST isdst=0

(Sorry about the wrap.) The first line is the current time. The next
four lines indicate the DST changes. I'm not entirely sure how to read
this though. It looks like it says that 3/11 01:59:59 is followed by
3/11 03:00:00, and 11/4 01:59:59 is followed by 11/4 01:00:00.
Is that the correct interpretation?

Where are leap year and leap second information stored? I thought
they would be in here but I can't find any sign of them. Sure,
the leap year pattern has been cast in stone for a long time, but
leap seconds are put in "as needed", there's no formula for them.
See for instance:

http://en.wikipedia.org/wiki/Leap_second

Admittedly leap seconds don't matter much in most calculations, but
it would be nice to know that this adjustment isn't just swept under
the rug.

Thanks,

David Mathog