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If you are looking for basic, manual date input, using a Text Component is often the simplest approach.  It can be helpful to assign an input mask to the component (99/99/9999) and a minimum length of 8.

//Take in a date string and insert slashes
if(data.dob && data.dob.length == 8)
{
    var userDate = data.dob;
    value = userDate.slice(0,2) + '/' + userDate.slice(2,4) + '/' + userDate.slice(4,8);
}
else
    value = data.dob;

Capture a date based on signature input to a Text Component

If you wish to capture a date based on a user making a mark in a signature component, add a Text Component with an API Key of dateSigned and mark it disabled to prevent user manipulation of the field.  Add a Signature Component with an API Key of signature.

var current = new Date(data.dateSigned);
if(data.signature && current.toString() === 'Invalid Date')
{
    var d = new Date();
    value = d.toLocaleDateString();
}
else
    value = data.dateSigned;