Rest V2 - Invalid Timezone error 400

We received an error saying the timezone “Asia/Calcutta” is invalid. While it is a “valid” timezone, we understand it should actually be Asia/Kolkata. Is there a list of Keap supported timezones that we need to follow, or is there some standard that is being followed? In app, there appears to be ~87 timezones in the drop down, but there are significantly more “valid” timezones, and even more “non-canonical” timezones.

Sent only: [“time_zone” => “Asia/Calcutta”]

{“code”:400,“message”:“Time Zone is invalid”,“status”:“Bad Request”,“details”:[{“domain”:“contact”,“resource”:“PATCH /rest/v2/contacts/73222”}]}

I think I found it: What timezones do Contact calls accept? - Keap Developer Portal
Is this correct and the latest correct version?

That’s correct.