0.12.3dev: Convert the `format` argument to `strftime()` to `str`, because Python 2.4 and 2.5 choke on unicode.
0.12.3dev: Convert the `format` argument to `strftime()` to `str`, because Python 2.4 and 2.5 choke on unicode.

Patch by guidod-2007-. Closes #10322.


git-svn-id: 764b04d0c6fbbea0ee05220aef3208173ff13049@10828 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac