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Can you please try to remove your current integration and create it again?
I made a test on my side and the submission date was passed correctly to the spreadsheet.
Let us know if the issue persists.
I've opened a separate thread for your concern so that we can better assist you, please refer to this link: http://www.jotform.com/answers/544052
I have also opened one for you, please refer to this link: http://www.jotform.com/answers/544050.
We advise that users open their own threads for each question or concern that they have. We will address the threads accordingly.