Ok thanks for your feedback @Jack_T. Good to know and please let me know as soon as this is production ready. I am referring to this issue: Firestore dates written as strings, not Timestamps, which has been covered a lot of times on the forum. Was hoping that RAW mode is the solution. In a nutshell: The date is correctly formatted for Firestore if it is not run through an additional transformer but just generated in the input field for the Firestore update query.