compile errors on timezone database
Jesper Norgaard Welen
jnorgard at Prodigy.Net.MX
Wed Dec 3 06:28:23 UTC 2003
The rules "LastSat 24:00" and "LastSun 0:00" may not always be
equivalent, although I don't know if the specific programming is taking
care of that. But I suspect not.
Consider September 1933, which is within the range of the mentioned
rules. Last Saturday of September is the 30.th. of September, so
"LastSat 24:00" would change exactly going into Sunday October 1.st. at
0:00. However, "LastSun 0:00" would be September 24.th. at 0:00 or
exactly one week before. This really occurs because Sunday October 1.st.
is not part of September.
I had a similar problem with my definition of a Greenland timezone,
which had the effect that it took place one week from when it should.
I don't know if this actually is calculated like this with the tz
package. I just want to point out the conceptual problem, for your
Jesper Nørgaard Welen
From: Olson, Arthur David (NIH/NCI) [mailto:olsona at dc37a.nci.nih.gov]
Sent: 2. december 2003 15:17
To: Tz (tz at elsie.nci.nih.gov); 'diane_kledzik at notes.ntrs.com'
Subject: RE: compile errors on timezone database
Back in 1998 zic was tweaked to accept 24:00 in "AT" fields; my guess is
that the version of zic being used predates that change. (If the vendor
hasn't stripped things and you're on a POSIX system, you can do a...
...to get a version number; anything under 7.94 lacks the tweak;
anything beyond 7.95 has the tweak.)
Mindful of folks with old compilers, it may be best to change the
northamerica file to avoid use of 24:00, changing the "lastSat 24:00"
references to "lastSun 0:00". (And perhaps using zic should generate
warning messages if a 24:00 shows up and zic's -v option has been
From: Diane Kledzik [mailto:Diane_Kledzik at notes.ntrs.com]
Sent: Tuesday, December 02, 2003 12:52 PM
To: tz at lecserver.nci.nih.gov
Cc: eggert at twinsun.com
Subject: compile errors on timezone database
As an fyi, I receive compile errors when I compile (using "zic") the
time zone database downloaded in the tzdata2003d.tar file from your
ftp://elsie.nci.nih.gov/pub/ site. The error messages read:
"northamerica", line 954: invalid time of day "northamerica", line 955:
invalid time of day "northamerica", line 978: invalid time of day
"northamerica", line 979: invalid time of day
Those lines in the northamerica file are below. Is it safe to assume I
need to change the 24:00 references to 0:00 instead? Has anyone else
run into this problem?
Rule Mont 1927 1937 - Apr lastSat 24:00 1:00
Rule Mont 1927 1937 - Sep lastSat 24:00 0
Rule Toronto 1930 1937 - Apr lastSat 24:00 1:00
Rule Toronto 1930 1937 - Sep lastSat 24:00 0
Thanks for your help,
More information about the tz