Issue Summary

While it is possible to see Calendars on a space, by clicking on Calendars in the left sidebar, depending on the timezone set in your Atlassian Account profile preferences, the calendar will return a code error.

Steps to Reproduce

1. Login into https://id.atlassian.com/manage-profile/account-preferences
2. Set your timezone specific timezones such as PDT8PST or EST5EDT
3. Wait for a few minutes to wait the sync for products/account to take place
4. Go to Confluence, access the Space and click on Calendar

Expected Results

Calendar loads correctly.

Actual Results

After setting the timezone to PDT8PST or EST5EDT, the Calendar returns the code error tied to the time used for the configuration. For example, for PDT8PST:

error: Invalid time zone specified: -07:00
         errorHashCode: <codeerror>
         pageName: SPACE_CALENDARS
         releaseId: CLASSIC-master-6099
         ssrRendered: false
         stack: RangeError: Invalid time zone specified: -07:00

Workaround

Change the timezone to another one, for example America/Los Angeles for -07:00 or US/Eastern for -04:00.