🚀 go-pugleaf

Hello.

I'm having trouble with some time.h functions. the result is different
for different c++ builder versions. I have the following code:

//---------------------------------------------------------------------

#include "time.h"
#include "stdio.h"

//...

   long t = time(0);
   struct tm *ltime = localtime(&t);

   char timestr[16];
   strftime( timestr, 16 , "%H:%M:%S", ltime);

   char ResultBuffer[1000];
   sprintf(ResultBuffer,"%s (%u) dst=%u", timestr, t,ltime->tm_isdst);

   Edit1->Text = ResultBuffer;

//---------------------------------------------------------------------

When executing this code in Borland C++Builder 6 and Codegear C++Builder
  2007 I get different results:

C++Builder 6:
14:24:40 (1205501080) dst=0

C++Builder 2007:
14:24:40 (1205497480) dst=1

So the result (in local time) is the same, but I'm using the value from
time(0) (which in this case is 1205501080 or 1205497480) to do
calculations compared to a time I receive from an external DLL. in
C++Builder 6 the time calculation was correct, but in C++ Builder 2007 I
get calculation errors of 3600 seconds.

It seems that the time(0) function in C++Builder 2007 seems to return
the local time, instead of the GMT time? I don't know what has changed
in the libraries, so I don't know if a fix now will still work within 6
months or next year. What correction do I have to do to make the
calculations work properly?

I am in timezone GMT+1:00 (so my _timezone has a value of -3600)

Can someone please clarify this for me?

Regards,
Dave