title: How to enforce that one date is bigger than the other in angular reactive form?
body: <p>I've the following reactive form:</p>
  <pre><code>  newTripForm = this.formBuilder.group({
      name: new FormControl('', Validators.compose([Validators.required, Validators.minLength(3)])),
      startDate: new FormControl('', Validators.required),
      endDate: new FormControl(''),
    });
  </code></pre>
  <p>How can I add a validator enforcing that the endDate is bigger than the startDate? Also, is there a way to check that the startDate and endDate are dates? I didn't found any validator?</p>
  <p>Thank you very much(and sorry for the noob question)</p>