Brian Pandola f96ac40fca
Fix: ApproximateArrivalTimestamp should be epoch with millisecond precision (#3764)
The Record class was already capturing a unix timestamp, but it was incorrectly
converting it to ISO format when sending back to the client.

Updating the model to return the correct timestamp necessitated a minor change
to one of the tests because `botocore` converts non-timezone aware timestamps
to local time.
2021-03-11 08:54:21 +00:00
..
2020-09-02 08:51:51 +01:00
2019-10-31 10:36:05 -07:00