My suggestion would be "don’t use the DatePipe". It’s trivial to roll your own that is not dependent on browser support:
declare function require(name:string): any;
let format = require('date-fns/format');
@Pipe({
name: 'dateformat'
})
@Injectable()
export class DateFormatPipe implements PipeTransform {
transform(d: Date | string, fmt: string): string {
let rv = format(d, fmt);
return rv;
}
}