/** '2026-05-05' as '05.05.', with the year as '05.05.2026'. */
export function formatDayDe(day: string, withYear = false): string {
  const [year, month, date] = day.split('-');
  return withYear ? `${date}.${month}.${year}` : `${date}.${month}.`;
}

/**
 * Closes a sentence with one period. A day formatted by formatDayDe ends with
 * its own dot ('13.10.'), which then is the end of the sentence.
 */
export function endSentence(text: string): string {
  return text.endsWith('.') ? text : `${text}.`;
}