which file control TIME Zone?

[mcclnx mcc]

I have been test  Daylight saving time on REDHAT AS
3.6.  All cron jobs between 2:00 A.M. to 3:00 A.M.
will not execute.

We also have SUN Solaris servers, but SUN understand
it and will execute  cron jobs .

Does anyone know how to make it run on Redhat LINUX
system?

which file control Time ZOne setup?

Thanks.

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