Technical Q&A

OPS 21 - dlsDelta field in PRAM's time zone MachineLocation record (17-May-1999)

Q: How is the dlsDelta field in PRAM's time zone MachineLocation record used and set?

A: Currently, the dlsDelta field is not being used by Macintosh system software, nor is its meaning defined. There are plans to use it in the future, so it's important that you preserve its current value if you ever use WriteLocation to set the value of gmtDelta. See the description of the WriteLocation routine in "WorldWide Development: Guide to System Software," available on the latest Developer CD for details on getting and setting gmtDelta while leaving dlsDelta intact. In short, the code looks like this:

    VAR
        myLocation:     Location;
        myGMTDelta:     LongInt;
        tempSignedByte: SignedByte;
    :
    tempSignedByte := myLocation.dlsDelta;
    myLocation.gmtDelta := myGMTDelta;
    myLocation.dlsDelta := tempSignedByte;
-- Mark Cookson
Worldwide Developer Technical Support

Technical Q&As | Contents
Previous Question | Next Question

To contact us, please use the Contact Us page.