.ics exported timestamps on classes in local timezome, not EST

[SpiritSeal]

Describe the bug
Attempted to upload class .ics file while Google Calendar and PC timezone set to MST. Uploaded class events were shifted 2 hours (i.e. class that starts at 12:30 EST is listed as starting at 12:30 MST).

To Reproduce
Steps to reproduce the behavior. Example:

1. Set machine and Google Calendar timezone to MST
2. Add classes/ other events to gt-scheduler
3. Export events as .ics file
4. Import events into Google Calendar

Expected behavior
Events timestamps are added to Google Calendar in EST time rather than local time.

Screenshots
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