flaschengeist-frontend/src/utils/datetime.ts

export function formatDateTime(
  date: Date,
  useDate = true,
  useTime = false,
  useSeconds = false,
  useWeekday = false
) {
  const dateTimeFormat = new Intl.DateTimeFormat([], {
    year: useDate ? 'numeric' : undefined,
    month: useDate ? '2-digit' : undefined,
    day: useDate ? '2-digit' : undefined,
    weekday: useWeekday ? 'long' : undefined,
    hour: useTime ? '2-digit' : undefined,
    minute: useTime ? '2-digit' : undefined,
    second: useTime && useSeconds ? '2-digit' : undefined,
  });
  return dateTimeFormat.format(date);
}

export function asHour(date: Date) {
  return formatDateTime(date, false, true);
}