It might be possble that you have encounter this bug. https://jira.atlassian.com/browse/TEAMCAL-558.
This is a known bug which occur when user add MSExchange 2010 published calendar by URL.
Other than, you should check if your system date is properly set. Refer to this document https://confluence.atlassian.com/display/CONFKB/'The+datetime+zone+id+is+not+recognised'+Error+Appears+Due+to+System+Timezone on how to perform that.
Hope this helps.
Thanks you for your reply. I added the timezone string as below, and restarted confluence.
-Duser.timezone="(UTC+02:00) Harare, Pretoria"
The Calendar is still showing the error above, am I putting the string incorrectly? Sorry to bother, but Confluence downtime is not ideal for the business.
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