I have a Collector App set up for Inspecting Storm Water Management Ponds. Each pond is represented in a polygon layer and is related to an inspections table (1 to many). Both the pond layer and inspections table are in Oracle, related via ArcGIS Catalog and published as a feature service in ArcGIS Server 10.3.1
Using an iPad, when I view an inspection record, the Date fields show up as long comma separated numbers. In the pond layer, the data fields show up properly as "December 21, 2018 6:00:00 pm". In the database itself, these values are exactly the same. In the Web Map, all of the date fields for both the pond layer and the inspection table are configured the same (December 21, 2018 6:00:00 pm). I have tried various web map configurations, but none of the inspection records' show the date properly in the related table pop-up window.
Note: The same configuration displays date and time fields properly on my Android device.