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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I have tried to make this work but my findings are pointing out to a fact that there is no way to specify the user's choice on the "Disable Date Ranges" entry. This means, yes, you can specify today by simply stating "today" and limit the ranges accordingly. However, since the user's choice is a complete unknown there is no way to specify it like "today".
I tried to create two different forms and pass data from one to another. However, since the data is not able to be specified as well I could not make it work.
I will let you know if I can come up with a workaround. Don't hesitate to share your more detailed ideas with us since they might help us make this work.
Please contact us again if you need any further assistance.