opt-cc/static/src/app/utils/chart-utils.ts

export class ChartUtils {

  public static getShortDateString(date): string {
    const isoDate = date.slice(0, 10);
    const dayDate = parseInt(isoDate.slice(8, 10));
    return (dayDate < 10 ? "0" + dayDate : dayDate) + '.'
      + isoDate.slice(5, 7) + '.' + isoDate.slice(2, 4);
  }
}