Creating a feature class with a Date field that does not allow null values, and adding it as a feature service to the GeoForm Web Application template, automatically populates the Date entry form with 12/29/1899.
Last Published: January 28, 2016ArcGIS Online
Bug ID Number
April 6, 2015
June 11, 2020
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
There is an option in the Geoform builder on the Fields tab. Click the gear icon next to the non-nullable field and check the checkbox for "Set this field with the current date and time". This should be handled by the app creator before distributing to app users.