Why is input value from ng-model not saved to another input?

Question

JavaScript

I select a date in the datetime input, it is not selected in the format in which I need it, so I hang ng-model on the datetime input, and from there I take the value and format it into another input using value, but nothing appears in the second input.
If I do the same, but instead of the second input I put, for example, span, then the value is displayed as it should.

<div>
  <input type="datetime-local" name="input" ng-model="example"/>
  <input type="text" ng-model="exDate" value='{{example | date: "yyyy-MM-ddTHH:mm:ss"}}'/>
  <button ng-click="add()">Добавить</button>
</div>

How to fix?

Answer 1

Use parsers/formatters for this.
link to doc