Этот код, где я вычитаю дни с даты, не дает правильных результатов.
function get_Ash_Wednesday_date (year, Easter_month, Easter_day) {
var Easter_date = new Date();
Easter_date.setFullYear(year, Easter_month-1, Easter_day);
var Ash_Wednesday = new Date();
Ash_Wednesday.setFullYear(year);
Ash_Wednesday.setDate(Easter_date.getDate()-46);
return Ash_Wednesday;
}
С даты Пасхи я вычитаю 46 дней. Обычно это относится к февралю и должно учитывать високосные годы. Расчетные даты в пепельной среде отключены на один или два дня, например. на 2012 год Пепел в среду должен быть 02/22, в 2013 году должно быть 02/13, для 2014 года должно быть 03/05, для 2015 года должно быть 02/18, для 2016 года должно быть 02/10. Месяц ошибочен каждый раз, должен быть февраль или март. Что может объяснить разницу в возвращенные дни и месяц?
Year: 2012 Ash Wednesday month 11 Ash Wednesday day 23 Easter Month: 4 Easter Day: 8
Year: 2013 Ash Wednesday month 12 Ash Wednesday day 16 Easter Month: 3 Easter Day: 31
Year: 2014 Ash Wednesday month 12 Ash Wednesday day 5 Easter Month: 4 Easter Day: 20
Year: 2015 Ash Wednesday month 11 Ash Wednesday day 20 Easter Month: 4 Easter Day: 5
Year: 2016 Ash Wednesday month 12 Ash Wednesday day 12 Easter Month: 3 Easter Day: 27
Year: 2017 Ash Wednesday month 12 Ash Wednesday day 1 Easter Month: 4 Easter Day: 16
Year: 2018 Ash Wednesday month 11 Ash Wednesday day 16 Easter Month: 4 Easter Day: 1
Year: 2019 Ash Wednesday month 12 Ash Wednesday day 6 Easter Month: 4 Easter Day: 21
Year: 2020 Ash Wednesday month 11 Ash Wednesday day 27 Easter Month: 4 Easter Day: 12
Year: 2021 Ash Wednesday month 11 Ash Wednesday day 19 Easter Month: 4 Easter Day: 4
Year: 2022 Ash Wednesday month 12 Ash Wednesday day 2 Easter Month: 4 Easter Day: 17
Year: 2023 Ash Wednesday month 11 Ash Wednesday day 24 Easter Month: 4 Easter Day: 9
Year: 2024 Ash Wednesday month 12 Ash Wednesday day 16 Easter Month: 3 Easter Day: 31
Year: 2025 Ash Wednesday month 12 Ash Wednesday day 5 Easter Month: 4 Easter Day: 20
Year: 2026 Ash Wednesday month 11 Ash Wednesday day 20 Easter Month: 4 Easter Day: 5
Year: 2027 Ash Wednesday month 12 Ash Wednesday day 13 Easter Month: 3 Easter Day: 28
Year: 2028 Ash Wednesday month 12 Ash Wednesday day 1 Easter Month: 4 Easter Day: 16
Year: 2029 Ash Wednesday month 11 Ash Wednesday day 16 Easter Month: 4 Easter Day: 1
Year: 2030 Ash Wednesday month 12 Ash Wednesday day 6 Easter Month: 4 Easter Day: 21
Year: 2031 Ash Wednesday month 11 Ash Wednesday day 28 Easter Month: 4 Easter Day: 13
Year: 2032 Ash Wednesday month 12 Ash Wednesday day 13 Easter Month: 3 Easter Day: 28
Year: 2033 Ash Wednesday month 12 Ash Wednesday day 2 Easter Month: 4 Easter Day: 17
Year: 2034 Ash Wednesday month 11 Ash Wednesday day 24 Easter Month: 4 Easter Day: 9
Year: 2035 Ash Wednesday month 12 Ash Wednesday day 10 Easter Month: 3 Easter Day: 25
Year: 2036 Ash Wednesday month 11 Ash Wednesday day 28 Easter Month: 4 Easter Day: 13
Year: 2037 Ash Wednesday month 11 Ash Wednesday day 20 Easter Month: 4 Easter Day: 5
Year: 2038 Ash Wednesday month 12 Ash Wednesday day 10 Easter Month: 4 Easter Day: 25
Year: 2039 Ash Wednesday month 11 Ash Wednesday day 25 Easter Month: 4 Easter Day: 10
Year: 2040 Ash Wednesday month 11 Ash Wednesday day 16 Easter Month: 4 Easter Day: 1
Year: 2041 Ash Wednesday month 12 Ash Wednesday day 6 Easter Month: 4 Easter Day: 21
Year: 2042 Ash Wednesday month 11 Ash Wednesday day 21 Easter Month: 4 Easter Day: 6