I have perl v5.8.0 built for i686-linux-thread-multi-ld and doing 
perl -e '$ENV{TZ} = "DST";print scalar localtime(), "\n";'

[download]
works fine for me.

In reply to Re: %ENV{TZ} does not always affect CORE::localtime() under multi-threaded perl by The Mad Hatter
in thread %ENV{TZ} does not always affect CORE::localtime() under multi-threaded perl by dda

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