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c++macostimemacos-carboncore-foundation

Getting UTC offset of system time zone on Mac (C++)

I'm trying to get the system time zone expressed as an offset from UTC in minutes - something like the Windows function GetTimeZoneInformation(LPTIME_ZONE_INFORMATION). Is there something in Corefoundation or Carbon that could give me this information?

Solution

  • Checkout the Date and Time Programming Guide for Core Foundation.

    This is untested, but how about:

    CFTimeZoneRef tz = CFTimeZoneCopySystem();
CFTimeInterval minsFromGMT = CFTimeZoneGetSecondsFromGMT(tz, CFAbsoluteTimeGetCurrent()) / 60.0;
CFRelease(tz);