bb-datepicker does not respect timezone offset for ISO 8601 string input

[Blackbaud-SarahMalick]

Expected behavior

I should be able to assign an ISO 8601 string with a timezone offset to the bb-datepicker model and have it respect the given timezone offset.

Actual behavior

Assigning an ISO 8601 string with a timezone offset to the bb-datepicker model results in a date field with the previous date, instead of the intended assigned date.

Steps to reproduce

1. Navigate to the plunker from the datepicker component page: http://skyux.developer.blackbaud.com/components/datepicker/

2. Set self.date2 = '2017-07-31T00:00:00+00:00';

3. Notice that the Date field has the date listed as 7/30/2017 instead of 7/31/2017.

   • Note: the date field will say 7/30/2017 regardless of the offset specified (+/- xx:xx).

Plunker

http://plnkr.co/edit/wvjwsPDPsN60DeNfxgEA?p=preview

[Blackbaud-PatrickOFriel]

The code in question is probably here: https://github.com/blackbaud/skyux/blob/master/js/sky/src/datepicker/datepicker.parser.js#L11