ValueError: year=1899 is before 1900; the datetime strftime() methods require year >= 1900

[Ryan J Ollos]

Maybe we can raise a TracError for this case, or add/or a warning to the timeline page.

2016-05-26 14:42:07,161 Trac[main] ERROR: Internal Server Error: <RequestWithSession "GET '/timeline?from=1900-01-02&daysback=7&authors='">, referrer 'https://bugs.jqueryui.com/'
Traceback (most recent call last):
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/web/main.py", line 562, in _dispatch_request
    dispatcher.dispatch(req)
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/web/main.py", line 249, in dispatch
    resp = chosen_handler.process_request(req)
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/timeline/web_ui.py", line 251, in process_request
    format='%Y-%m-%d', tzinfo=req.tz)
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/util/datefmt.py", line 318, in format_date
    return _format_datetime(t, format, tzinfo, locale, 'date')
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/util/datefmt.py", line 299, in _format_datetime
    return _format_datetime_without_babel(t, format)
  File "/var/www/bugs.jqueryui.com/private/pve/local/lib/python2.7/site-packages/trac/util/datefmt.py", line 246, in _format_datetime_without_babel
    text = t.strftime(str(format))
ValueError: year=1899 is before 1900; the datetime strftime() methods require year >= 1900