Daylight savings time problem

[giovannigiorgio]

Hello friends,
I'm developing a win32 not MFC program which needs to display a date and time so made: current year, month and day, but hour retrieved by a CSV file.
This is the code I'm using:

SYSTEMTIME st;
time_t rawtime;
time ( &rawtime );
tm * timeinfo = localtime ( &rawtime );
timeinfo->tm_year = st.wYear-1900;
timeinfo->tm_mon = st.wMonth-1;
timeinfo->tm_mday = st.wDay; 
timeinfo->tm_hour=nHour;
timeinfo->tm_min=nMin;
mktime(timeinfo); 

where 'nHour' is the hour retrieved by CSV file.
I want to get the exact CSV file hour, but when Daylight savings time occur I get nHour plus or minus 1 depending on season.
How to avoid this program behavior?
Thanks

[kbw]

If you're working with time zones or DST, you need to work with GMT (UTC).

Also, you shouldn't write into the static tm* like that. Declare your own and use that.

[giovannigiorgio]

Hello kbw,
thank you for the reply, but I don't handstand. Can you post an example about how my code should be?