feature request: option to set timezone

[katiepeters]

Please correct me if I missed something, but it looks like you can't currently make the DatePicker component use a different timezone than the one local to the user. Maybe switch to using moment-timezone and provide an optional prop that lets us set a timezone?

I'm working on an app where the calendar needs to be viewed in time local to a geographic location that might be different than the user's location. But the component doesn't take this into account.

So for example, the geographic location is New York, but the user is in China. 'Today' in the calendar will be one day ahead of what it should be since China is so far ahead time-wise.

[rafeememon]

Think this is a similar request to #498

[martijnrusschen]

This should be possible now.

[vazbloke]

Since the move from moment to date-fns, how can this be done now?