JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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'm not sure if I understand your query correctly. Do you mean to display only from 9AM to 20PM in the drop down list of time? If so, it is possible by adding some custom code to your JotForm. I see that the Time is not enabled for the Date field on your form. I have cloned your JotForm to my account and enabled Time in the Date field and injected some CSS code to the form to hide some options from the hours.
Here is the CSS code added to the form:
Please see the cloned version of your form with added CSS code below:
Please feel free to clone it again to your account.
Hope this information helps!