The analysis I've performed.
1) Change the windows timezone to +9:30 Adelaide, Daylight Savings (DST)
on, windows clock changes to 00:16
2) Start csh.exe and echo $TZ,
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3) Run test executable program:
#include <time.h>
#include <stdio.h>
int main()
{
/* time_t is unsigned long */
time_t time_t1;
char pcTime1[100];
time(&time_t1);
printf ("daylight=%d\n_daylight=%d\n", daylight, _daylight);
tzset();
strftime(pcTime1,99,"%Y%m%d %H%M%S %Z",localtime(&time_t1));
printf( "\ntime() = %d\ncftime() = %s\nctime() =
%s\ndaylight=%d\n_daylight=%d",
time_t1,
pcTime1,
ctime(&time_t1), daylight, _daylight);
return 0;
}
Get reported back ctime of 01:16 - one hour in advance of Windows clock.
Note that in this timezone, at this time of year daylight savings is not
applicable until October.
4) Change the windows timezone to +9:30 Adelaide, Daylight Savings (DST)
off, windows clock stays the same - DST not applicable (see above).
5) Start csh.exe and echo $TZ,
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6) Run test executable program:
Get reported back ctime of 01:16 - one hour in advance of Windows clock
still.
7) Change the month in windows to November - Daylight savings is now in
affect for this Timezone and DST is set to on. Note windows says the time
is 01:19.
8) Start csh.exe and echo $TZ,
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9) Run test executable program.
Get reported back ctime of 00:19 - one hour prior to windows.
10) Change the daylight savings to off in windows, windows sets time to
00:20
11) Start csh.exe and echo $TZ,
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12) Run the test executanle program.
Get reported back a ctime of 00:19 - now the same time as windows.
My point here is that ctime does not seem to be accurately keeping step
with windows and is determining the daylight savings based on something I
can;t locate. In the instance when daylight savings is not in affect it
means the time is out by one hour.
Can someone please verify my findings and confirm I'm not going mad or is
this a known madness I can cure?
Thanks
Gary
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