Comment 7 for bug 143784

Looks like this fix broke 3 CMF tests:

http://mail.zope.org/pipermail/cmf-tests/2006-November/003324.html

After further investigation, I would say that "YYYY-MM-DD" dates
are in the ISO8601 format, and thus GMT based.

Dates in format "YYYY-MM-DD HH:MM:SS" are also in ISO format, but
Zope wasn't recognizing they as such. Now Zope does.

I argue that CMF was misusing DateTime, and that the new behavior
is the correct, otherwise we'll never get a consistent behavior
for the ISO dates.

I argue that the specific getBeginAndEndTimes method from
CalendarTool.py should also use the timezone, analog to what the
getEventsForThisDay method does.

Thoughts?