Hello @SusannahC
Your request has been collected. We will update this thread once the mentioned feature is released.
I would like to add to this topic the possibility of dd.mm.yyyy format. If written in this form (example: 16.07.2025) it is not recognized as a date by OnlyOffice. I can set the date to be displayed in dd.mm.yyyy format BUT it must be introduced as dd/mm/yyyy in the cell in order to be recognized as a date.