plone/plone.app.widgets — pull request #68 by thet (2014-03-31 19:04:25+00:00)
Title: Add default_timezone widget attribute to DatetimeWidget. If used and set...

... to a valid Olson DB/pytz timezone identifier or to an callback returning such, the datetime object returned by the widget will be localized to that timezone. This changes the timezone related behavior from version 1.4.0.

@garbas @jensens please review :)