Re: getting the correct GMT offset for a given date

[Thomas Tempelmann <listuser at tempel dot org>]

This is a code snippet from my Joliet code, which is not Carbon, though:

        // get the GMT offset
        MachineLocation loc;
        ReadLocation (&loc);    // careful: must not be called from interrupts 
(or 
from most File Mgr calls)!
        long tmpGMTDelta;
        Boolean tmpGMTknown;
        if ((loc.latitude | loc.longitude) != 0) {
                // sign-extend the 3 byte GMT value into a long:
                tmpGMTDelta = loc.u.gmtDelta & 0x00FFFFFF;
                if (tmpGMTDelta & 0x00800000) {
                        tmpGMTDelta |= 0xFF000000;
                }
                tmpGMTknown = true;
        } else {
                tmpGMTDelta = 0;
                tmpGMTknown = false;
        }
        gmtDeltaSec = tmpGMTDelta;
        gmtDeltaKnown = tmpGMTknown;

Maybe this works in Carbon, too.
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