Team Calendar is not recording event time correctly for Hong Kong Timezone

Summary

Team Calendar is not recording event time correctly for Hong Kong Timezone

Environment

Confluence 6.11.2
Team Calendar 6.0.27

Steps to Reproduce

1. Install Team Calendar
2. Add 2 new Calendars with the Time zone set as below respectively:
   • Asia/Kuala Lumpur (+0800)
   • Asia/Hong Kong (+0800)
3. Add one new Event into each of the calendars with the same date and time
   • For example: 28th March 2019, 8:00 AM
4. Export both of the Calendars into iCalendar and this will trigger the browser to download an .ics file
5. View the exported .ics files in a text editor and look for the events created

Expected Results

The Events in both calendars are recorded as the same time since both of the calendar's Timezone is in GMT+8 and both places do not observe Daylight Saving

Actual Results

The event that is found in Hong Kong timezone's calendar export is off by one hour earlier.

Hong Kong Timezone Calendar Export

BEGIN:VEVENT
DTSTAMP:20190328T005433Z
DTSTART;TZID=Asia/Hong_Kong:20190328T090000
DTEND;TZID=Asia/Hong_Kong:20190328T100000
SUMMARY:HK Time
CATEGORIES:other

Kuala Lumpur Timezone Calendar Export

BEGIN:VEVENT
DTSTAMP:20190328T005424Z
DTSTART;TZID=Asia/Kuala_Lumpur:20190328T080000
DTEND;TZID=Asia/Kuala_Lumpur:20190328T090000
SUMMARY:KL Time
CATEGORIES:other

Information

Although both of the events will still be displaying correctly within Confluence/Team Calendar itself:

But if the calendar is being subscribed from an external source such as Google Calendar, the event time will not be displayed correctly because it is off by an hour.

Workaround

1. Avoid using Hong Kong Timezone if you need to subscribe the calendar from an external source