Timezones missing from initial Team Calendar screen

Summary

When you first install Team Calendars, and navigate to the Calendars page for the first time (http://BASE-URL/calendar/mycalendar.action) it prompts you to select a timezone:
Screen Shot 2017-12-06 at 11.35.35 AM.png

However, it appears that the list of timezones here is much smaller than what is available when changing your profile timezone, or selecting one when creating a new calendar.

For example, I am not able to see any Alaska or Hawaii timezones. (i.e. GMT-9, GMT-10)

Environment

• Confluence 6.5.1
• Team Calendars 5.3.20

Steps to Reproduce

1. Install Team Calendars from Find Add-ons.
2. Navigate to Calendars menu (http://BASE-URL/calendar/mycalendar.action)
3. You'll be prompted to select a timezone. See attachment.

Expected Results

All timezones available to Confluence users should be listed here.

Actual Results

The list is a smaller list than what is available.

Workaround

1. Select a timezone.
2. Navigate to your User Profile and change the timezone there (under Settings)
3. Additionally, when creating a new calendar, select the desired timezone.