All files getAdventStartDate.ts

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import { startOfWeek, differenceInDays, addWeeks } from "date-fns";
 
/**
 *
 * @param {number} churchYear - The full year of the Church year as it will be at Easter
 *                              Sunday (e.g. 2024 means that Advent begins in 2023)
 */
export const getAdventStartDate = (churchYear: number) => {
  const stAndrewsDay = new Date(churchYear - 1, 10, 30);
  const nearestSunday = startOfWeek(stAndrewsDay);
 
  if (differenceInDays(stAndrewsDay, nearestSunday) < 4) {
    return nearestSunday;
  }
 
  return addWeeks(nearestSunday, 1);
};