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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I'm sorry for the trouble caused to you.
I did try to download your forms submission data in excel and I was able to replicate the issue you are having. It seems that any date which is greater than 9 of a calendar day is not being displayed.
I am creating a bug report and sending it to our back end team. They will take a look and find out the possible cause of this issue. We will get back to you as soon as we have any update from them.
We have fixed the problem you have reported regarding the trimmed values on Excel files.
Please let us know if you have any other questions or concerns.