I don't know about other processes which access the TZ variable, but
the Cobol function CURRENT-DATE uses the value of TZ as a look-up into
the table TZTAB.LIB.SYS which contains rather cryptic entries which
include the correct switch-over dates for the time changes for every
year to 2028, for a lot of specific geographical areas. This is documented
in the HP Cobol ref manual under the CURRENT-DATE function.

Joe Alexander   Systems Manager 
Biowhittaker, Inc.  Walkersville MD
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>>> "[log in to unmask]" 04/07/98 01:55pm >>>
I don't understand why you are changing the last 3 char of the TZ
variable, I
don't think anything actually cares what is there, it's informational only
isn't
it?