ion-select display format code example
Example 1: ion datetime interval 30 minutes
<ion-datetime displayFormat="HH:mm" [(ngModel)]="myDate" minuteValues="0,30">
Example 2: ion-select cancel text
<ion-select cancel-text="Cancelar">
<ion-select-option *ngFor="let country of countries" value="{{ country.name }}">
{{ country.name }}
</ion-select-option>
</ion-select>