A common year starting on Thursday is any non-leap year (i.e. a year with 365 days) that begins on Thursday, 1 January, and ends on Thursday, 31 December. Its dominical letter hence is D. The most recent year of such kind was 2015, and the next one will be 2026 in the Gregorian calendar or, likewise, 2021 and 2027 in the obsolete Julian calendar, see below for more.
This is the only common year with three occurrences of Friday the 13th: those three in this common year occur in February, March, and November. Leap years starting on Sunday share this characteristic, for the months January, April and July. From February until March in this type of year is also the shortest period (one month) that runs between two instances of Friday the 13th. Additionally, this is the one of only two types of years overall where a rectangular February is possible, in places where Sunday is considered to be the first day of the week. Common years starting on Friday share this characteristic, when Monday is considered to be the first day of the week.
This year has four months (February, March, August and November) which begin on a weekend-day.
Calendars
Calendar for any common year starting on Thursday, 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 Thursday (dominical letter D)
January
Wk
Mo
Tu
We
Th
Fr
Sa
Su
01
01
02
03
04
02
05
06
07
08
09
10
11
03
12
13
14
15
16
17
18
04
19
20
21
22
23
24
25
05
26
27
28
29
30
31
February
Wk
Mo
Tu
We
Th
Fr
Sa
Su
05
01
06
02
03
04
05
06
07
08
07
09
10
11
12
13
14
15
08
16
17
18
19
20
21
22
09
23
24
25
26
27
28
March
Wk
Mo
Tu
We
Th
Fr
Sa
Su
09
01
10
02
03
04
05
06
07
08
11
09
10
11
12
13
14
15
12
16
17
18
19
20
21
22
13
23
24
25
26
27
28
29
14
30
31
April
Wk
Mo
Tu
We
Th
Fr
Sa
Su
14
01
02
03
04
05
15
06
07
08
09
10
11
12
16
13
14
15
16
17
18
19
17
20
21
22
23
24
25
26
18
27
28
29
30
May
Wk
Mo
Tu
We
Th
Fr
Sa
Su
18
01
02
03
19
04
05
06
07
08
09
10
20
11
12
13
14
15
16
17
21
18
19
20
21
22
23
24
22
25
26
27
28
29
30
31
June
Wk
Mo
Tu
We
Th
Fr
Sa
Su
23
01
02
03
04
05
06
07
24
08
09
10
11
12
13
14
25
15
16
17
18
19
20
21
26
22
23
24
25
26
27
28
27
29
30
July
Wk
Mo
Tu
We
Th
Fr
Sa
Su
27
01
02
03
04
05
28
06
07
08
09
10
11
12
29
13
14
15
16
17
18
19
30
20
21
22
23
24
25
26
31
27
28
29
30
31
August
Wk
Mo
Tu
We
Th
Fr
Sa
Su
31
01
02
32
03
04
05
06
07
08
09
33
10
11
12
13
14
15
16
34
17
18
19
20
21
22
23
35
24
25
26
27
28
29
30
36
31
September
Wk
Mo
Tu
We
Th
Fr
Sa
Su
36
01
02
03
04
05
06
37
07
08
09
10
11
12
13
38
14
15
16
17
18
19
20
39
21
22
23
24
25
26
27
40
28
29
30
October
Wk
Mo
Tu
We
Th
Fr
Sa
Su
40
01
02
03
04
41
05
06
07
08
09
10
11
42
12
13
14
15
16
17
18
43
19
20
21
22
23
24
25
44
26
27
28
29
30
31
November
Wk
Mo
Tu
We
Th
Fr
Sa
Su
44
01
45
02
03
04
05
06
07
08
46
09
10
11
12
13
14
15
47
16
17
18
19
20
21
22
48
23
24
25
26
27
28
29
49
30
December
Wk
Mo
Tu
We
Th
Fr
Sa
Su
49
01
02
03
04
05
06
50
07
08
09
10
11
12
13
51
14
15
16
17
18
19
20
52
21
22
23
24
25
26
27
53
28
29
30
31
Applicable years
Gregorian Calendar
In the (currently used) Gregorian calendar, alongside Tuesday, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-four common years per cycle or exactly 11% start on a Thursday. 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 corresponding ISO year has 53 weeks, and the ISO week 10 (which begins March 2) and all subsequent ISO weeks occur earlier than in all other common years.
Gregorian common years starting on Thursday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
16th century
prior to first adoption (proleptic)
1587
1598
17th century
1609
1615
1626
1637
1643
1654
1665
1671
1682
1693
1699
18th century
1705
1711
1722
1733
1739
1750
—
1761
1767
1778
1789
1795
19th century
1801
1807
1818
1829
1835
1846
1857
1863
1874
1885
1891
20th century
1903
1914
1925
1931
1942
1953
1959
—
1970
1981
1987
1998
21st century
2009
2015
2026
2037
2043
2054
2065
2071
2082
2093
2099
22nd century
2105
2111
2122
2133
2139
2150
—
2161
2167
2178
2189
2195
23rd century
2201
2207
2218
2229
2235
2246
2257
2263
2274
2285
2291
24th century
2303
2314
2325
2331
2342
2353
2359
—
2370
2381
2387
2398
25th century
2409
2415
2426
2437
2443
2454
2465
2471
2482
2493
2499
400-year cycle
0–99
9
15
26
37
43
54
65
71
82
93
99
100–199
105
111
122
133
139
150
161
167
178
189
195
200–299
201
207
218
229
235
246
257
263
274
285
291
300–399
303
314
325
331
342
353
359
370
381
387
398
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). A leap year has two adjoining dominical letters (one for January and February and the other for March to December, as 29 February has no letter). 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 3, 14 and 20 of the cycle are common years beginning on Thursday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Thursday.
Julian common years starting on Thursday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
15th century
1405
1411
1422
1433
1439
1450
—
1461
1467
1478
1489
1495
16th century
1506
1517
1523
1534
1545
1551
1562
1573
1579
1590
—
17th century
1601
1607
1618
1629
1635
1646
1657
1663
1674
1685
1691
18th century
1702
1713
1719
1730
—
1741
1747
1758
1769
1775
1786
1797
19th century
1803
1814
1825
1831
1842
1853
1859
1870
—
1881
1887
1898
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
Holidays
International
Valentine's Day falls on a Saturday
World Day for Grandparents and the Elderly falls on July 26
The Feast of Christ the King falls on November 22 (or on its earliest possible date of October 25 in versions of the calendar between 1925 and 1962)
The First Sunday of Advent falls on November 29
The Immaculate Conception falls on a Tuesday
Gaudete Sunday falls on December 13
Rorate Sunday falls on December 20
Australia and New Zealand
Australia Day falls on a Monday
Waitangi Day falls on a Friday
Daylight saving ends on April 5
ANZAC Day falls on a Saturday
Mother's Day falls on May 10
Father's Day falls on September 6
Daylight saving begins on September 27 in New Zealand and October 4 in Australia
British Isles
Saint David's Day falls on a Sunday
Mother's Day falls on its earliest possible date of March 1, or on March 8, March 15, March 22 or March 29
Saint Patrick's Day falls on a Tuesday
Daylight saving begins on March 29
Saint George's Day falls on a Thursday
Father's Day falls on its latest possible date, June 21. This is only common year when Father's Day falls on ISO week 25. It falls on ISO week 24 in all of the common years.
Orangeman's Day falls on a Sunday
Daylight saving ends on its earliest possible date, October 25
Guy Fawkes Night falls on a Thursday
Saint Andrew's Day falls on a Monday
Canada
Daylight saving begins on its earliest possible date, March 8
Mother's Day falls on May 10
Victoria Day falls on its earliest possible date, May 18
Father's Day falls on its latest possible date, June 21
Canada Day falls on a Wednesday
Labour Day falls on its latest possible date, September 7 – this is the only common year when Victoria Day and Labour Day are sixteen weeks apart (they are fifteen weeks apart in all other common years)
Thanksgiving Day falls on October 12
Daylight saving ends on its earliest possible date, November 1
Denmark
The Constitution Day falls on a Friday
Germany
The reunification falls on a Saturday
United States
Martin Luther King Jr. Day falls on January 19
President's Day falls on February 16
Daylight saving begins on its earliest possible date, March 8
Mother's Day falls on May 10
Memorial Day falls on its earliest possible date, May 25
Juneteenth falls on a Friday
Father's Day falls on its latest possible date, June 21
Independence Day falls on a Saturday
Labor Day falls on its latest possible date, September 7 – this is the only common year when Memorial Day and Labor Day are fifteen weeks apart (they are fourteen weeks apart in all other common years)
Grandparents' Day falls on its latest possible date, September 13
Columbus Day falls on October 12
Daylight saving ends on its earliest possible date, November 1
Thanksgiving Day falls on November 26
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