* [9fans] dst shift is shifty
@ 2011-03-25 21:46 Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-25 22:08 ` erik quanstrom
0 siblings, 1 reply; 9+ messages in thread
From: Lyndon Nerenberg (VE6BBM/VE7TFX) @ 2011-03-25 21:46 UTC (permalink / raw)
Am I the only person still an hour behind the PST->PDT shift?
I recall this happening last year, too ...
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-25 21:46 [9fans] dst shift is shifty Lyndon Nerenberg (VE6BBM/VE7TFX)
@ 2011-03-25 22:08 ` erik quanstrom
2011-03-25 22:53 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
0 siblings, 1 reply; 9+ messages in thread
From: erik quanstrom @ 2011-03-25 22:08 UTC (permalink / raw)
On Fri Mar 25 17:48:43 EDT 2011, lyndon at orthanc.ca wrote:
> Am I the only person still an hour behind the PST->PDT shift?
> I recall this happening last year, too ...
>
i thought i fixed the timezone files a couple of years ago.
ladd; date
Fri Mar 25 18:07:09 EDT 2011
ladd; timein US_Pacific
Fri Mar 25 15:07:23 PDT 2011
did you not copy the new US_Pacific to /adm/timezone/local?
- erik
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-25 22:08 ` erik quanstrom
@ 2011-03-25 22:53 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-26 3:38 ` erik quanstrom
2011-03-26 15:13 ` erik quanstrom
0 siblings, 2 replies; 9+ messages in thread
From: Lyndon Nerenberg (VE6BBM/VE7TFX) @ 2011-03-25 22:53 UTC (permalink / raw)
> did you not copy the new US_Pacific to /adm/timezone/local?
Being in Canada_Pacific, no. I see an update is required.
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-25 22:53 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
@ 2011-03-26 3:38 ` erik quanstrom
2011-03-26 15:13 ` erik quanstrom
1 sibling, 0 replies; 9+ messages in thread
From: erik quanstrom @ 2011-03-26 3:38 UTC (permalink / raw)
On Fri Mar 25 18:54:59 EDT 2011, lyndon at orthanc.ca wrote:
> > did you not copy the new US_Pacific to /adm/timezone/local?
>
> Being in Canada_Pacific, no. I see an update is required.
hmmm. iirc, i made the us change when the law in canada was
in doubt. sorry for falling down on the job.
as a hack, if you copy US_Pacific, except for the dates from 1973-1974,
that should be the right temporary fix
; diff -c /n/sourcesdump/2006/0401/plan9/adm/timezone/US_Pacific US_Pacific
/n/sourcesdump/2006/0401/plan9/adm/timezone/US_Pacific:1,6 - Canada_Pacific:1,6
PST -28800 PDT -25200
9943200 25664400 41392800 57718800 73447200 89168400
- 104896800 120618000 126669600 152067600 162352800 183517200
+ 104896800 120618000 136346400 152067600 167796000 183517200
i'll submit a patch.
- erik
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-25 22:53 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-26 3:38 ` erik quanstrom
@ 2011-03-26 15:13 ` erik quanstrom
2011-03-27 20:48 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
1 sibling, 1 reply; 9+ messages in thread
From: erik quanstrom @ 2011-03-26 15:13 UTC (permalink / raw)
>> did you not copy the new US_Pacific to /adm/timezone/local?
>
> Being in Canada_Pacific, no. I see an update is required.
i tried to send this off-list, but your zone has no mx record.
sorry to the rest of the list for spam.
anyway, lyndon could you check the timezones in
/n/sources/contrib/quanstro/timezone/tz/Canada_*
to make sure i haven't made any silly mistakes?
will submit if you approve.
- erik
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-26 15:13 ` erik quanstrom
@ 2011-03-27 20:48 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-27 21:13 ` erik quanstrom
0 siblings, 1 reply; 9+ messages in thread
From: Lyndon Nerenberg (VE6BBM/VE7TFX) @ 2011-03-27 20:48 UTC (permalink / raw)
> i tried to send this off-list, but your zone has no mx record.
> sorry to the rest of the list for spam.
And I tried a direct reply, but your MTA is convinced orthanc.ca has
no MX record. Which is odd since it most most certainly does. I've
noticed ndb/dns has been acting oddly lately, though. For the last
couple of months my CPU server has been complaining that
ftp.rfc-editor.org has a malformed IP address while my terminal has no
issue with it. It hasn't been annoying enough to track down since I
have a workaround, but something weirde is going on here ...
> anyway, lyndon could you check the timezones in
> /n/sources/contrib/quanstro/timezone/tz/Canada_*
> to make sure i haven't made any silly mistakes?
Attached is a trivial timezone file dumper I wrote this morning before
the benefit of coffee. When I examine the output of runs against
*_Pacific (the system's and Eric's new Canada_*) it strikes me that
the time shifts are happening at UTC time rather than the local
timezone offset. E.g., here is a sample of
/adm/timezone/Canada_Pacific:
PST PDT
Sun Apr 26 02:00:00 GMT 1970 Sun Oct 25 01:00:00 GMT 1970
Sun Apr 25 02:00:00 GMT 1971 Sun Oct 31 01:00:00 GMT 1971
Sun Apr 30 02:00:00 GMT 1972 Sun Oct 29 01:00:00 GMT 1972
Sun Apr 29 02:00:00 GMT 1973 Sun Oct 28 01:00:00 GMT 1973
Sun Apr 28 02:00:00 GMT 1974 Sun Oct 27 01:00:00 GMT 1974
Should these not be taking place either seven or eight hours later
according to GMT? (I.e. 0200 PST, 0200 PDT) Am I misinterpreting the
values in the timezone files?
--lyndon
-------------- next part --------------
#include <u.h>
#include <libc.h>
#include <stdio.h>
struct tz {
int offset;
char zone[5];
};
static char EPARSE[] = "parse error";
void main (int argc, char **argv)
{
struct tz tz[2];
Tm *t;
long i[2];
int rc;
char *s;
rc = scanf("%s %d %s %d", &tz[0].zone, &tz[0].offset,
&tz[1].zone, &tz[1].offset);
if (rc == EOF || rc != 4) {
exits(EPARSE);
}
printf("%28s\t%28s\n", tz[0].zone, tz[1].zone);
for (;;) {
rc = scanf("%ld %ld", &i[0], &i[1]);
if (rc == EOF) {
exits(0);
}
if (rc != 2) {
exits(EPARSE);
}
t = gmtime(i[0]);
s = asctime(t);
s[28] = '\0';
printf("%s\t", s);
t = gmtime(i[1]);
s = asctime(t);
s[28] = '\0';
printf("%s\n", s);
}
exits(0);
}
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-27 20:48 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
@ 2011-03-27 21:13 ` erik quanstrom
2011-03-27 21:20 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
0 siblings, 1 reply; 9+ messages in thread
From: erik quanstrom @ 2011-03-27 21:13 UTC (permalink / raw)
> Attached is a trivial timezone file dumper I wrote this morning before
> the benefit of coffee. When I examine the output of runs against
> *_Pacific (the system's and Eric's new Canada_*) it strikes me that
> the time shifts are happening at UTC time rather than the local
> timezone offset. E.g., here is a sample of
> /adm/timezone/Canada_Pacific:
>
> PST PDT
> Sun Apr 26 02:00:00 GMT 1970 Sun Oct 25 01:00:00 GMT 1970
> Sun Apr 25 02:00:00 GMT 1971 Sun Oct 31 01:00:00 GMT 1971
> Sun Apr 30 02:00:00 GMT 1972 Sun Oct 29 01:00:00 GMT 1972
> Sun Apr 29 02:00:00 GMT 1973 Sun Oct 28 01:00:00 GMT 1973
> Sun Apr 28 02:00:00 GMT 1974 Sun Oct 27 01:00:00 GMT 1974
>
> Should these not be taking place either seven or eight hours later
> according to GMT? (I.e. 0200 PST, 0200 PDT) Am I misinterpreting the
> values in the timezone files?
i'll take another look. i thought i worked this out for the us timezones,
and while confusing, i thought everything was working.
- erik
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-27 21:13 ` erik quanstrom
@ 2011-03-27 21:20 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-27 22:31 ` Steve Simon
0 siblings, 1 reply; 9+ messages in thread
From: Lyndon Nerenberg (VE6BBM/VE7TFX) @ 2011-03-27 21:20 UTC (permalink / raw)
> i'll take another look. i thought i worked this out for the us timezones,
> and while confusing, i thought everything was working.
Heh. Either it's endemic or my morning coding skills are fscked:
lyndon at frodo% tzdump < Australia_West
WST WDT
Sun Oct 27 02:00:00 GMT 1974 Sun Mar 2 02:00:00 GMT 1975
Sun Oct 30 02:00:00 GMT 1983 Sun Mar 4 02:00:00 GMT 1984
Sun Nov 17 02:00:00 GMT 1991 Sun Mar 1 02:00:00 GMT 1992
Sun Oct 28 02:00:00 GMT 2007 Sun Mar 30 02:00:00 GMT 2008
Sun Oct 26 02:00:00 GMT 2008 Sun Mar 29 02:00:00 GMT 2009
I vote for the latter at this point ...
^ permalink raw reply [flat|nested] 9+ messages in thread
* [9fans] dst shift is shifty
2011-03-27 21:20 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
@ 2011-03-27 22:31 ` Steve Simon
0 siblings, 0 replies; 9+ messages in thread
From: Steve Simon @ 2011-03-27 22:31 UTC (permalink / raw)
One I wrone a while ago when I have similar problems with UK timezones:
/n/sources/contrib/steve/rc/tzdump
-Steve
^ permalink raw reply [flat|nested] 9+ messages in thread
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2011-03-25 21:46 [9fans] dst shift is shifty Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-25 22:08 ` erik quanstrom
2011-03-25 22:53 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-26 3:38 ` erik quanstrom
2011-03-26 15:13 ` erik quanstrom
2011-03-27 20:48 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-27 21:13 ` erik quanstrom
2011-03-27 21:20 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2011-03-27 22:31 ` Steve Simon
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