Timezone utility

[Paul Eggert]

   > From:	Henry Grebler [SMTP:henryg at optimation.com.au]
   > Sent:	Monday, August 07, 2000 10:31 PM

   > To address this issue, I have written a little utility, cvt_time. I
   > enclose source, Makefile and man page.

I would add this functionality to "date" rather than having a separate
utility.  I believe that GNU "date" already has options to do what you
want; see its -d, -f, and -r options.  If you have time, perhaps you
could contribute implementations of these options to the tz date
implementation.

When faced with problems like that, I generally use something like the
following shell transcript.

$ zdump -v Australia/Hobart | grep 2000
Australia/Hobart  Sat Mar 25 15:59:59 2000 UTC = Sun Mar 26 02:59:59 2000 EST isdst=1
Australia/Hobart  Sat Mar 25 16:00:00 2000 UTC = Sun Mar 26 02:00:00 2000 EST isdst=0
Australia/Hobart  Sat Aug 26 15:59:59 2000 UTC = Sun Aug 27 01:59:59 2000 EST isdst=0
Australia/Hobart  Sat Aug 26 16:00:00 2000 UTC = Sun Aug 27 03:00:00 2000 EST isdst=1

One advantage of this approach is that you don't need to specify magic
numbers like 967305600.