10-17-2001
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Join Date: Aug 2001
Last Activity: 26 February 2016, 12:31 PM EST
Location: Ashburn, Virginia
Posts: 9,926
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There is no sensible reason to prohibit you from fiddling with the TZ variable. You inherit a copy of your parent's TZ variable, but if you change yours, no one else's will change. You can also spawn a child with a different value than yours if you want like this:
TZ=CST4CDT date
This works with bourne and korn shells, the c-shell doesn't allow it. But even there you can save the old value, change it, run date, and change it back.