Function getEasterHolidays

services/holidays/index.js:64–110

(year)

 * @see https://en.wikipedia.org/wiki/Computus
 */
export function getEasterHolidays(year) {
  if (year < 1900 || year > 2199) {
    throw new NotFoundError({
      name: 'NotFoundError',
      message: 'Ano fora do intervalo suportado entre 1900 e 2199.',
      type: 'feriados_range_error',
    });
  }

  const pascalFullMoonMonthDay = getPascalFullMoonDates();
  const [refMonth, refDay] = pascalFullMoonMonthDay[year % 19];
  const movingDate = new Date(year, refMonth, refDay);
  const holidays = [];
  movingDate.setDate(movingDate.getDate() + 7 - movingDate.getDay());
  const easterDate = formatDate(movingDate);
  holidays.push({
    date: easterDate,
    name: 'Páscoa',
    type: 'national',
    weekday: getWeekdayName(easterDate),
  });
  movingDate.setDate(movingDate.getDate() - 2);
  const goodFridayDate = formatDate(movingDate);
  holidays.push({
    date: goodFridayDate,
    name: 'Sexta-feira Santa',
    type: 'national',
    weekday: getWeekdayName(goodFridayDate),
  });
  movingDate.setDate(movingDate.getDate() - 45);
  const carnavalDate = formatDate(movingDate);
  holidays.push({
    date: carnavalDate,
    name: 'Carnaval',
    type: 'national',
    weekday: getWeekdayName(carnavalDate),
  });
  movingDate.setDate(movingDate.getDate() + 107);
  const corpusChristiDate = formatDate(movingDate);
  holidays.push({
    date: corpusChristiDate,
    name: 'Corpus Christi',
    type: 'national',
    weekday: getWeekdayName(corpusChristiDate),
  });
  return holidays;
}

/**
 * Combina feriados móveis e fixos.