Issue #1972 has been updated by Usaku NAKAMURA.


(*** this message is a mere memo. ***)

(1) ruby_setenv() doesn't changes CRT environment workarea.
    tzset() sees it, so ENV["TZ"] has no meaning in this case.

(2) localtimexv() doesn't call tzset(). (see its comment)
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http://redmine.ruby-lang.org/issues/show/1972

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