Maps selected dates from one time zone to another when reloading data.

[kielgillard]

• selectedDates returns moments according to the calendar and time zone of the current configuration.
• When reloading data, a new configuration is retrieved from the data source.
• This new configuration potentially contains a different calendar and/or time zone.
• Right now, the selected dates does not represent the same moment across time zones after a reload.
• This PR maps those moments across time zones.

Consider: Selecting a specific day when the calendar uses an Alaskan time zone but when reloading returning a calednar using an Australian time zone.

Actual behaviour: the day after is selected. Expected behaviour: the same day should be selected.

[patchthecode]

will look at this in a bit