time one hour early?
Bert Freudenberg
bert at isgnw.CS.Uni-Magdeburg.De
Thu May 6 10:01:37 UTC 1999
On Thu, 6 May 1999, Markus Kohler wrote:
> Same problem on HP-UX.
>
> I live in Germany and we have Summertime.
>
> Could that explain it ?
It has to do with the problem. The Unix VMs ioSeconds() primitive is not
correct. I once tried to find a solution - but I did not succeed. I'll
attach the mail I sent to Ian one month ago. Maybe you guys have more
patience than me getting this right ...
-------------------------------------------
Hi Ian,
my Squeak still doesn't do "Time now" right. It's off by one hour. I
haven't really tracked it down, but I guess it has to do with daylight
saving. I wrote a little C program:
#include <stdio.h>
#include <sys/time.h>
#include <unistd.h>
int main()
{
struct timeval tv;
gettimeofday(&tv, 0);
printf("timezone: %i\n", timezone);
printf("daylight: %i\n", daylight);
printf("localtime(): %s", asctime(localtime(&tv.tv_sec)));
printf("gmtime(): %s", asctime(gmtime(&tv.tv_sec)));
printf("timezone: %i\n", timezone);
printf("daylight: %i\n", daylight);
}
This produces
timezone: 0
daylight: 0
localtime(): Wed Apr 7 15:17:57 1999
gmtime(): Wed Apr 7 13:17:57 1999
timezone: -3600
daylight: 1
but Time now gives 2:18:19 pm ...
First observation: timezone is not set before localtime() is called.
Second: It does not reflect daylight saving.
Any idea?
-------------------------------------------
/bert
--
Bert Freudenberg Department of
Simulation and
mailto:bert at isg.cs.uni-magdeburg.de Computer Graphics
http://isgwww.cs.uni-magdeburg.de/isg/bert.html Univ. of Magdeburg
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