Days when other festivals overlap Christmas Day

output.txt

Hanukah
  [...]
  1902-12-24
  1905-12-22
  1908-12-18
  1910-12-25
  1913-12-23
  1916-12-19
  1921-12-25
  1924-12-21
  1927-12-18
  1932-12-23
  1935-12-20
  1938-12-17
  1940-12-24
  1943-12-21
  1946-12-17
  1951-12-23
  1954-12-19
  1957-12-17
  1959-12-25
  1962-12-21
  1965-12-18
  1970-12-22
  1973-12-19
  1978-12-24
  1981-12-20
  1984-12-18
  1989-12-22
  1992-12-19
  1995-12-17
  1997-12-23
  2000-12-21
  2003-12-19
  2005-12-25
  2008-12-21
  2011-12-20
  2016-12-24
  2019-12-22
  2022-12-18
  2024-12-25
  2027-12-24
  2030-12-20
  2035-12-25
  2038-12-21
  2041-12-17
  2046-12-23
  2049-12-19
  2054-12-25
  2057-12-21
  2060-12-17
  2065-12-22
  2068-12-18
  2073-12-24
  2076-12-20
  2079-12-17
  2084-12-22
  2087-12-19
  2092-12-23
  2095-12-20
  2098-12-18
Eid al-Fitr
  1707-12-25
  1772-12-25
  1870-12-24
  2098-12-24
Eid al-Adha
  1746-12-23
  1811-12-25
  1909-12-22
  1974-12-24
  2039-12-25

overlaps.py

import convertdate
import datetime


def get_in_year(gregorian_year, calendar, month, day):
    day = day - 1
    system = getattr(convertdate, calendar)
    yearS = system.from_gregorian(gregorian_year, 1, 1)[0]
    yearE = system.from_gregorian(gregorian_year, 12, 31)[0]
    for year in range(yearS, yearE+1):
        out = system.to_gregorian(year, month, day)
        if out[0] == gregorian_year:
            yield datetime.date(*out)


def overlaps_christmas(event, days, calendar, month, day):
    print event
    for year in range(1700, 2100+1):
        for date in get_in_year(year, calendar, month, day):
            if date.month == 12 and 25-days <= date.day <= 25:
                print ' ', date


overlaps_christmas('Hanukah', 8, 'hebrew', convertdate.hebrew.KISLEV, 25)
overlaps_christmas('Eid al-Fitr', 1, 'islamic', 10, 1)
overlaps_christmas('Eid al-Adha', 4, 'islamic', 12, 10)