how to create datetime from a negative epoch in Python

Question

First timer on StackExchange.

I am working with ArcGIS Server and Python. While trying to execute a query using the REST endpoint to a map service, I am getting the

Answer 1

This works for me:

datetime.datetime(1970, 1, 1) + datetime.timedelta(seconds=(-3739996800000/1000))

→ datetime.datetime(1851, 6, 27, 0, 0)

This would have been better asked on StackOverflow since it is more Python specific than it is GIS-specific.