How to determine whether the OS has the latest DST rules

yoshito_umaoka at yoshito_umaoka at
Thu Nov 6 20:47:39 UTC 2008

> I am working on an issue related to Brazil timezone. Our code reads 
> the DST rules from windows registry instead of tzdata.
> My question is -- how do I determine whether the windows system has 
> applied the latest timezone DST rules from the following registry? I
> don't know how to interpret the binary data

To access time zone rules used by Windows, you can use the API below -

-Yoshito Umaoka

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