If you are looking to extend your Webflow form with more input types read on.
Here is the link to my custom form page where I have demonstrated what can be done when you combine the Webflow form widget and the embed widget.
To use this technique you will need the from block on your page. You can learn more about the Webflow form in the this tutorial.
You also will need to use the embed widget. You can find more about the embed widgets in the tutorials.
Now lets get to it.
1.) Place the form widget on your page and style it anyway you like.
2.) place the embed widget in the form, where you would like your extra fields to show.
3.) Then place your code;
<label for="date">Date:</label> <input class="w-input" type="date" name="date">
Your form is not ready to go. You will receive this information in the Webflow dashboard and in your email.