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 end 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 Friday 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 type of 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). This type of year also has the longest period (also 14 months) without a Tuesday the 13th, from July of this year until September of the next common year (that being on Saturday), unless the next year is a leap year (which is also a Saturday), then the period is reduced to only 11 months.
From February until March in this type of year is also the shortest period (one month) that runs between two months that begin exactly on the first day of the week, in areas where Monday is regarded the first day of the week.
This is the one of two types of years overall where a rectangular February is possible, in places where Monday is considered to be the first day of the week. Common years starting on Thursday share this characteristic, when Sunday is considered to be the first day of the week.
Additionally, this type of year has three months (February, March and November) beginning exactly on the first day of the week, in areas which Monday is considered the first day of the week. Leap years starting on Monday share this characteristic on the months of January, April and July.
This year has two months (May and August) which begin on a weekend-day. Since at least one month begins on each day of the week in all years, this is the fewest possible number of months to begin on a weekend-day in a given year; this also occurs in a leap year starting on Friday, in which case the two months are May and October.
Calendars
Calendar for any common year starting on Friday, presented as common in many English-speaking areas
January
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
February
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
March
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
April
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
May
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
June
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
July
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
August
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
September
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
October
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
November
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
December
Su
Mo
Tu
We
Th
Fr
Sa
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
ISO 8601-conformant calendar with week numbers for any common year starting on Friday (dominical letter C)
January
Wk
Mo
Tu
We
Th
Fr
Sa
Su
53
01
02
03
01
04
05
06
07
08
09
10
02
11
12
13
14
15
16
17
03
18
19
20
21
22
23
24
04
25
26
27
28
29
30
31
February
Wk
Mo
Tu
We
Th
Fr
Sa
Su
05
01
02
03
04
05
06
07
06
08
09
10
11
12
13
14
07
15
16
17
18
19
20
21
08
22
23
24
25
26
27
28
March
Wk
Mo
Tu
We
Th
Fr
Sa
Su
09
01
02
03
04
05
06
07
10
08
09
10
11
12
13
14
11
15
16
17
18
19
20
21
12
22
23
24
25
26
27
28
13
29
30
31
April
Wk
Mo
Tu
We
Th
Fr
Sa
Su
13
01
02
03
04
14
05
06
07
08
09
10
11
15
12
13
14
15
16
17
18
16
19
20
21
22
23
24
25
17
26
27
28
29
30
May
Wk
Mo
Tu
We
Th
Fr
Sa
Su
17
01
02
18
03
04
05
06
07
08
09
19
10
11
12
13
14
15
16
20
17
18
19
20
21
22
23
21
24
25
26
27
28
29
30
22
31
June
Wk
Mo
Tu
We
Th
Fr
Sa
Su
22
01
02
03
04
05
06
23
07
08
09
10
11
12
13
24
14
15
16
17
18
19
20
25
21
22
23
24
25
26
27
26
28
29
30
July
Wk
Mo
Tu
We
Th
Fr
Sa
Su
26
01
02
03
04
27
05
06
07
08
09
10
11
28
12
13
14
15
16
17
18
29
19
20
21
22
23
24
25
30
26
27
28
29
30
31
August
Wk
Mo
Tu
We
Th
Fr
Sa
Su
30
01
31
02
03
04
05
06
07
08
32
09
10
11
12
13
14
15
33
16
17
18
19
20
21
22
34
23
24
25
26
27
28
29
35
30
31
September
Wk
Mo
Tu
We
Th
Fr
Sa
Su
35
01
02
03
04
05
36
06
07
08
09
10
11
12
37
13
14
15
16
17
18
19
38
20
21
22
23
24
25
26
39
27
28
29
30
October
Wk
Mo
Tu
We
Th
Fr
Sa
Su
39
01
02
03
40
04
05
06
07
08
09
10
41
11
12
13
14
15
16
17
42
18
19
20
21
22
23
24
43
25
26
27
28
29
30
31
November
Wk
Mo
Tu
We
Th
Fr
Sa
Su
44
01
02
03
04
05
06
07
45
08
09
10
11
12
13
14
46
15
16
17
18
19
20
21
47
22
23
24
25
26
27
28
48
29
30
December
Wk
Mo
Tu
We
Th
Fr
Sa
Su
48
01
02
03
04
05
49
06
07
08
09
10
11
12
50
13
14
15
16
17
18
19
51
20
21
22
23
24
25
26
52
27
28
29
30
31
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.
For this kind of year, the ISO week 10 (which begins March 8) and all subsequent ISO weeks occur later than in all other years, and exactly one week later than Leap years starting on Thursday. Also, the ISO weeks in January and February occur later than all other common years, but leap years starting on Friday share this characteristic in January and February, until ISO week 8.
Gregorian common years starting on Friday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
16th century
prior to first adoption (proleptic)
1582
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. This is the only year when Halloween falls in ISO week 43. They fall in ISO week 44 in all other years.
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
Denmark
The Constitution Day falls on a Saturday
Germany
The reunification falls on a Sunday
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
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