When an ArcGIS Online layer is time enabled, required date fields that are not specified when editing in Web AppBuilder for ArcGIS are populated as 12/30/1899 after editing.
Last Published: June 21, 2019ArcGIS Online
Bug ID Number
July 13, 2015
May 31, 2023
Operating System Version
2008 R2 64 Bit
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.
Web AppBuilder for ArcGIS has the same behavior as Map Viewer in ArcGIS Online 7.2.
The date required field can be cleared and the default value '1899-12-30' is filed by the service from the back-end.
There is a bug of js-api 3.14 (online3.8), so the users saw a different behavior that has been fixed now.