Timezones

[McSwitch]

Handle Timezones In DateTime Display/Posting Layers:

We need to ensure that we always account for timezones when working with date/time/datetime to ensure internationalization compatibility. The trick here is to know both local time and international time, to ensure we don't loose meta information, for example: when setting flight times we need to know the local time in order to determine day/night hours.

To this point we should remove "date" and "time" type fields and only support "datetime" fields.
Maybe we should introduce some additional settings for datetime fields, like: explicit-timezone which will force users to set a timezone.