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iCalendar Timezone Problems and Recommendations
2. Identified implementation problems and recommendations
2.1. General time zone issues
2.1.3.Clause2.1.3How should a client / server handle a time zone fork? (For example: if DST changes in the US only and not in Canada and meetings were created using an EST5EDT time zone). This could create two new time zones EST5EDT_CA

2.1.3.3.

If no information in the calendar object can be used to detect the appropriate new time zone, a default choice could be used based on where the majority of the meetings usually occur.