When people submit their surveys, they have the option to chose either a web browser or in the field app. When data is submitting using the web browser, the date field correctly populated. However, when users the Survey123 field app the date field shows 1589482800000 instead of the correct date.

Why would the date field being doing this with the field app? Would have to do with the fact the date field is set as hidden on the survey form? I chose to hide the date field because I wanted it to auto-populate and not have the user pick a date.

Or do I need to unhide my date field and make it a read-only to make sure it populates correctly?