Hi @AVJeff,
I heard back from our team on this, and they were able to clarify that the API uses UTC time, while the web portal converts this to local time client side, which is why you’re seeing this slight difference.
For example, the ‘end_date_time’ gets converted to the local time (example for America/New_York), (i.e., ‘2020-12-09T23:59:59Z’ -> ‘2020-12-09T18:59:59’, so it wouldn’t include December 9th in this example).
I hope this helps to clarify!
Best,
Will