Show banner within range

Ionic Framework ionic-v3
1

Hello,

How to show banner if within date range:

    <ion-col>
        <ion-slides loop="true" autoplay="15000" pager>
            <ion-slide *ngFor="let item of banner;" (click)="openWithSystemBrowser(item.redirect_url)">
              <img style="width:100%" src="{{ bannerPath + '/' + item.banner }}"/>
            </ion-slide>
        </ion-slides>
    </ion-col>

It’s ionic syntax which confuses me.