Property date-time
Property is in the EST time zone.
User 1 is used to log in with web services, to create the data and then check the user interface for the result.
User 2 is used to read the data (in the user interface / web services).
The date is always returned in the property time zone (-04 is property time zone USA/New York)
.
Web service input user 1
2015-10-21T10:00:00
Web service reply to user 1
2015-10-21T 10:00:00.000 -04:00 (the date is returned in the property’s time zone)
User interface displays to user 1 and user 2
2015-10-21 10:00:00.000
* 
In the user interface, the property date-time is always the same.