I have the same problem.
- win7 x64
- update A September 2014 time zone update for Russia is available (KB2998527) installed
- Firefox 34.0
My timezone in windows settings is (UTC+03:00) Волгоград, Москва, Санкт-Петербург (RTZ 2).
In producteeve account settings i choosed (GMT+03:00) Moscow+00 value="Europe/Moscow"
When i open my workspace there is block on the top:
Your computer's time zone doesn't match your Producteev account settings. To avoid deadline confusion, update your Producteev time zone.
And when i add sheduled task on 15-th january it placed to 14-th january in calendar.
In task settings timezone is same account settings: (GMT+03:00) Moscow+00.
I temporarily solve the problem by using (GMT+02:00) Moscow-01 - Kaliningrad value="Europe/Kaliningrad" in account settings and task shedule settings.
Warning on the top not shown, tasks displaying in calendar properly.