Google Sheets: Submission date not working

Hi, everything is in the title ! Since 2 weeks or so, I do not have the submission date datas in the google sheets synchronized with my forms. Do you know how to resolve this issue? 

Thanks a lot

Have you modified integrated sheet? 

In general, reconnecting google sheet should fetch all data fresh. Please try deleting current integration and setting up new one: How-to-Integrate-Forms-with-Google-Sheets