When I create a one day, all-day event with the Outlook 365 Calendar REST API, I get an event spanning on two days unless I specify the proper time zone...
I have the same two days span problem as in this question. Is there a way to send the query without the fields StartTimeZone and EndTimeZone? It is a redundant information with the Start and End fields that contain the time zone as well, and somehow "Mountain Standard Time" (GMT-7) does not work in SF, but "US Mountain Standard Time" does, although both are in the doc, both at GMT-7, and I do not know what happens in the rest of the world when the time zone string is ambiguous like this.
This is the way it is supposed to work - in Outlook all day event spans one day only in a particular time zone. In all other time zones it spans 211 days.