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As logs were rotated at midnight this morning (at the end of the day 2012年03月11日), we detected that the logs were incorrectly renamed to *.log.2012年03月10日, causing logs from Saturday to be overwritten. I believe this bug is related to the transition to daylight saving time, as this is the only day in recent history that this has occurred.
I have attached a script to reproduce this bug. This works reliably in the US/Pacific time zone. To run it, execute "rm foo.log* ; sudo date 03112359.55 && python logger_test.py". This will cause ten records to be logged, across the midnight boundary from 2012年03月11日 23:59:55 to 2012年03月12日 00:00:05.
Expected behavior: the logs from 2012年03月11日 up to, but not including, 2012年03月12日 00:00:00 should be written to a file named "foo.log.2012年03月11日", and the remainder of the log entries should be written to "foo.log".
Actual behavior: the logs from 2012年03月11日 23:59 through, but not including, 2012年03月12日 00:00 are instead written to a file named "foo.log.2012年03月10日", and the remainder of the log entries are written to "foo.log".
This does not happen for any other day. For example: running "sudo date 02152359.55" in the above procedure correctly names the file "foo.log.2012年02月15日".

New changeset a5c4b8ccca8b by Vinay Sajip in branch '2.7':
Closes #14267: Corrected computation of rollover filename.
http://hg.python.org/cpython/rev/a5c4b8ccca8b
New changeset a1d9466441ff by Vinay Sajip in branch '3.2':
Closes #14267: Corrected computation of rollover filename.
http://hg.python.org/cpython/rev/a1d9466441ff
New changeset 30fe8a62046e by Vinay Sajip in branch 'default':
Closes #14267: Merged fix from 3.2.
http://hg.python.org/cpython/rev/30fe8a62046e