Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/1440#issuecomment-49155576
Hmm, just realized `Timestamp.toString` normalizes date and time according
to current timezone and makes almost all timestamp related tests timezone
sensitive. (Wouldn't notice this if I were in US...) Guess we have to blacklist
them for now, and this will revert part of #1396.
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