Hi I'm new in web development and I'm trying to make a firebase app with the firestore database. I have a user registration form and in this form I need to get the date. For the date I used datepicker but I can't get the selected date and after transform it into firestore Timestamp. I tried this but I don't know if something is correct:

Html form:

<input class=datepicker type=text id=subscriptionDeadline placeholder=Subscription Deadline>

Javascript code:

  var currentDate = $(.subscriptionDeadline).datepicker(getDate);

  var timeStamp = new firebase.firestore.Timestamp.fromDate(currentDate);

I get this error :

Uncaught TypeError: Cannot read property 'Timestamp' of undefined