Is there any calender that I can integrate into JotForm?

I would like to integrate a calendar into jotform, where people can pic dates and times that will actually also be available/visible to the next person that fill in the form (so that nobody pics the same dates). For example, if I fill in a form for August 3rd, the next person that fills in the form should see that this date is already taken. 

It would be perfect if the calendar could also be updated and changed outside of Jotform. Any chances that you have something like that?

thank you so much!

I would recommend taking a look at our Date Reservation widget, as this widget works similarly to your requirements. It will automatically disable any date that a previous user has selected in their submission.

Please take a look at the following demo form, where all dates that are grayed out are the ones that previous users have selected:

https://form.jotformpro.com/form/61475511548963

The following guide will describe how to add the widget to your form:

https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form

When it comes to updating the calendar from outside JotForm, I'm afraid that is not directly achievable with the widget, but you can always go and edit any of your form's submissions to change a date if needed:

https://www.jotform.com/help/325-How-to-Edit-Submissions-Made-on-Your-Forms

Please take a look at the Date Reservation widget, and let us know whether that will work to your satisfaction. Cheers