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If nothing is logged during an interval, the TimedRotatingFileHandler
will give bad names to future log files.
The enclosed example program sets up a logger that rotates the log every
second. It then logs a few messages with sleep of 1, 2, 4, 1 and 1
seconds between the messages. The log files will have names that
increase with one second per log file, but the content for the last file
will be generated a different second.
An example run produced the message
 2008年03月17日 09:16:06: 1 sec later
in a log file named badlogdir/logfile.2008年03月17日_09-16-02.
This problem was likely introduced in revision 42066. The root cause is
that self.rolloverAt is increased by self.interval in doRollover - but
if nothing was logged for a while, it should be increased by a multiple
of self.interval.

The attached program will generate log messages with a timestamp that
are logged into a file with an unexpected extension.
To run:
 mkdir badlogdir
 python badlogger.py
Running the program takes about 9 seconds.

Updated SVN, but not backported to 2.5 or earlier maintenance branches.