Ion-datetime custom options removes default buttons 'Done' and 'Cancel'

Ionic Framework
1

So adding the custom options below to an ion-datetime removes the default buttons ‘Done’ and ‘Cancel’. Am I supposed to add them in again?

this.datePickerOptions = {
            buttons: [{
              text: this.translate.instant('Today'),
              handler: () => {
                 console.log('Today button clicked');
              }
            }]
          };