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.
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If you are referring the form's "Expiration Date", it is possible to add years like 2016, 2017 on my tests. Please, see it from the below:
If the date is not acceptable, it gives a error message. So, this feature seems to work fine with the further years. Please, try it and let us know the results. If you are pointing a different spot, you can always reach us through here.