How to set default value to the input[type="date"]

The date should take the format YYYY-MM-DD. Single digit days and months should be padded with a 0. January is 01.

From the documentation:

A string representing a date.

Value: A valid full-date as defined in [RFC 3339], with the additional qualification that the year component is four or more digits representing a number greater than 0.

Your code should be altered to:

<input type="date" value="2013-01-08">

Example jsfiddle

<input type="date" id="myDate" />

Then in js :

_today: function () {
  var myDate = document.querySelector(myDate);
  var today = new Date();
  myDate.value = today.toISOString().substr(0, 10);
},

A possible solution:

document.getElementById("yourDatePicker").valueAsDate = new Date();

Using Moment.js:

var today = moment().format('YYYY-MM-DD');
document.getElementById("datePicker").value = today;