Английская Википедия:Common year starting on Friday

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A common year starting on Friday is any non-leap year (i.e. a year with 365 days) that begins on Friday, 1 January, and ends on Friday, 31 December. Its dominical letter hence is C. The most recent year of such kind was 2021 and the next one will be 2027 in the Gregorian calendar, or, likewise, 2022 and 2033 in the obsolete Julian calendar, see below for more. This common year is one of the three possible common years in which a century year can begin on, and occurs in century years that yield a remainder of 100 when divided by 400. The most recent such year was 1700 and the next one will be 2100.

Any common year that starts on Wednesday, Friday or Saturday has only one Friday the 13th: the only one in this common year occurs in August. Leap years starting on Thursday share this characteristic, but also have another one in February.

From July of the year that precedes this year until September in this type of year is the longest period (14 months) that occurs without a Friday the 17th. Leap years starting on Tuesday share this characteristic, from August of the common year that precedes it to October in that type of year.

Calendars

This is the only year type where the nth "Doomsday" (this year Sunday) is not in ISO week n; it is in ISO week n-1.

Applicable years

Gregorian calendar

In the (currently used) Gregorian calendar, alongside Sunday, Monday, Wednesday or Saturday, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Friday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.

Gregorian common years starting on Friday

Decade	1st	2nd		3rd		4th	5th		6th	7th	8th		9th	10th
16th century	prior to first adoption (proleptic)													1593	1599
17th century	1610	—		1621	1627	1638	1649		1655	1666	1677		1683	1694	1700
18th century	1706	1717		1723		1734	1745		1751	1762	1773	1779	1790	—
19th century	1802	1813	1819	1830		—	1841	1847	1858	1869	1875		1886	1897
20th century	1909	1915		1926		1937	1943		1954	1965	1971		1982	1993	1999
21st century	2010	—		2021	2027	2038	2049		2055	2066	2077		2083	2094	2100
22nd century	2106	2117		2123		2134	2145		2151	2162	2173	2179	2190	—
23rd century	2202	2213	2219	2230		—	2241	2247	2258	2269	2275		2286	2297
24th century	2309	2315		2326		2337	2343		2354	2365	2371		2382	2393	2399

400-year cycle

0–99	10	21	27	38	49	55	66	77	83	94
100–199	100	106	117	123	134	145	151	162	173	179	190
200–299	202	213	219	230	241	247	258	269	275	286	297
300–399	309	315	326	337	343	354	365	371	382	393	399

Julian calendar

In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). This sequence occurs exactly once within a cycle, and every common letter thrice.

As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1). Years 4, 15 and 26 of the cycle are common years beginning on Friday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Friday.

Julian common years starting on Friday

Decade	1st		2nd		3rd		4th		5th		6th		7th		8th		9th		10th
15th century	1406		1417		1423		1434		1445		1451		1462		1473	1479	1490		—
16th century	1501	1507	1518		1529		1535		1546		1557		1563		1574		1585		1591
17th century	1602		1613	1619	1630		—		1641	1647	1658		1669		1675		1686		1697
18th century	1703		1714		1725		1731		1742		1753	1759	1770		—		1781	1787	1798
19th century	1809		1815		1826		1837		1843		1854		1865		1871		1882		1893	1899
20th century	1910		—		1921	1927	1938		1949		1955		1966		1977		1983		1994
21st century	2005		2011		2022		2033	2039	2050		—		2061	2067	2078		2089		2095

Holidays

International

• • Valentine's Day falls on a Sunday
  • World Day for Grandparents and the Elderly falls on July 25
  • Halloween falls on a Sunday
  • Christmas Day falls on a Saturday

Roman Catholic Solemnities

• • Epiphany falls on a Wednesday
  • Candlemas falls on a Tuesday
  • Saint Joseph's Day falls on a Friday
  • The Annunciation of Jesus falls on a Thursday
  • The Nativity of John the Baptist falls on a Thursday
  • The Solemnity of Saints Peter and Paul falls on a Tuesday
  • The Transfiguration of Jesus falls on a Friday
  • The Assumption of Mary falls on a Sunday
  • The Exaltation of the Holy Cross falls on a Tuesday
  • All Saints' Day falls on a Monday
  • All Souls' Day falls on a Tuesday
  • The Feast of Christ the King falls on November 21 (or on its latest possible date of October 31 in versions of the calendar between 1925 and 1962)
  • The First Sunday of Advent falls on November 28
  • The Immaculate Conception falls on a Wednesday
  • Gaudete Sunday falls on December 12
  • Rorate Sunday falls on December 19

Australia and New Zealand

• • Australia Day falls on a Tuesday
  • Waitangi Day falls on a Saturday
  • Daylight saving ends on April 4
  • ANZAC Day falls on a Sunday, and in some years coincides with Easter Sunday falling on its latest possible date
  • Mother's Day falls on May 9
  • Father's Day falls on September 5
  • Daylight saving begins on September 26 in New Zealand and October 3 in Australia

British Isles

• • Saint David's Day falls on a Monday
  • Mother's Day falls on March 7, March 14, March 21, March 28 or on its latest possible date of April 4
  • Daylight saving begins on March 28
  • Saint Patrick's Day falls on a Wednesday
  • Saint George's Day falls on a Friday, and in some years coincides with Good Friday falling on its latest possible date
  • Father's Day falls on June 20
  • Orangeman's Day falls on a Monday
  • Daylight saving ends on its latest possible date, October 31
  • Guy Fawkes Night falls on a Friday
  • Saint Andrew's Day falls on a Tuesday

Canada

• • Daylight saving begins on its latest possible date, March 14
  • Mother's Day falls on May 9
  • Victoria Day falls on its latest possible date, May 24
  • Father's Day falls on June 20
  • Canada Day falls on a Thursday
  • Labour Day falls on September 6
  • Thanksgiving Day falls on October 11
  • Daylight saving ends on its latest possible date, November 7

United States

• • Martin Luther King Jr. Day falls on January 18
  • President's Day falls on its earliest possible date, February 15
  • Daylight saving begins on its latest possible date, March 14
  • Mother's Day falls on May 9
  • Memorial Day falls on its latest possible date, May 31
  • Juneteenth falls on a Saturday
  • Father's Day falls on June 20
  • Independence Day falls on a Sunday
  • Labor Day falls on September 6
  • Grandparents' Day falls on September 12
  • Columbus Day falls on October 11
  • Daylight saving ends on its latest possible date, November 7
  • Thanksgiving Day falls on November 25