Timetables on ''Canada/Eastern" fail to generate

[pferreir]

Example: ​http://indicobeta.cern.ch/conferenceDisplay.py?confId=78302

In [28]: c.getSchedule().getAdjustedStartDate(c.getTimezone())
Out[28]: datetime.datetime(2010, 1, 8, 17, 30, tzinfo=<UTC>)

In [29]: c2.getSchedule().getAdjustedStartDate(c2.getTimezone())
Out[29]: datetime.datetime(2010, 9, 17, 8, 0, tzinfo=<DstTzInfo 'Europe/Zurich' CEST+2:00:00 DST>)

In [31]: c.getTimezone()
Out[31]: 'Canada/Eastern'

In [32]: c2.getTimezone()
Out[32]: 'Europe/Zurich'

[pferreir]

OK, it seems this is causing the problem (conference.py:

    def getAdjustedStartDate(self,tz=None):
        if not tz:
            tz = self.getTimezone()
        if tz not in common_timezones:
            tz = 'UTC'
        return self.getStartDate().astimezone(timezone(tz))

Notice how tz is set as 'UTC' if the timezone is not in common_timezones. That's the case for Canada/Eastern...

[pferreir]

... we need not only to fix this by either removing the constraint or allowing the user to select only from common_timezones, but also to make sure normalizing the timetable generates for UTC events (since UTC is allowed as a valid timezone).

[pferreir]

Pytz 2010b apparently fixes this.

Thanks, Stuart.