DateTime in ion list header

Hello,

I want to display the birthdate of the person in ion-list header. But this does not work.

  <ion-list-header>
    <ion-img src="person.svg" item-left></ion-img>
    {{ 'Name' | translate }}: {{person.name}}<br>
    {{ 'Birthdate' | translate }}:
     <ion-datetime displayFormat="MMM DD, YYYY" [(ngModel)]=" person.birthdate"></ion-datetime>
  </ion-list-header>
}

But when I make so, it works

<ion-item>
    {{ 'Birthdate' | translate }}:
     <ion-datetime displayFormat="MMM DD, YYYY" [(ngModel)]=" person.birthdate"></ion-datetime>
</ion-item>