What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I test submitted your form https://www.jotform.com/22972953574466 but I could not reproduced the same "Error on Save due to expiration date" you showed us.
BUT I think, that error message have to do with the Form Submission Limits of the form.
Refer to this guide https://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form
If you set the limit on Expiration Date to be lower than current date -- that error will pop-up as a reminder.
If the problem still happens on your form while in the form builder, make sure to correct the Expiration Date setup on the Form Limits. That should make that error message go away.
Hope this help. Inform us if issue persist.