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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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.
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The basic PayPal integration is pretty simple on jotforms. Please take a look at the following guide to get the idea:
PayPal Forms ( http://www.jotform.com/help/50-PayPal-Forms )
Also, you can check the PayPal related form templates shared by other JotForm members:
Can you please provide more information on the calendar selection part? Is there a specific scenario you are trying to achieve?