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.
Yes it is possible to achieve your requirement. You can set "Expiration Date" of your JotForm. Once the expiration date/time is reached, the form will not accept any submissions. The following guide should help you on how to set the expiration date of your form: http://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form
Hope this helps.
Do get back to us if you have any questions.
In case you were wondering, there's currently no feature to set an activation date but there's a workaround which has been provided by our colleague Charlie. Please see this thread for details.
P.S. If you wish to reply, please do so in the thread itself (http://www.jotform.com/answers/490787) instead of via email, as there's currently an issue affecting emailed replies to forum notifications.