A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on Thursday 1 January, and ends on Friday 31 December. Its dominical letters hence are DC. The most recent year of such kind was 2004, and the next one will be 2032 in the Gregorian calendar or, likewise, 2016 and 2044 in the obsolete Julian calendar.
This is the only leap year with three occurrences of Tuesday the 13th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Monday share this characteristic, in the months of February, March, and November.
Any leap year that starts on Thursday has two Friday the 13ths: those two in this leap year occur in February and August. This is also the only year in which February has five Sundays, as the leap day adds that extra Sunday.
This year has three months (February, May and August) which begin on a weekend-day.
Calendars
Calendar for any leap 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
29
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 leap year starting on Thursday (dominical letter DC)
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
29
March
Wk
Mo
Tu
We
Th
Fr
Sa
Su
10
01
02
03
04
05
06
07
11
08
09
10
11
12
13
14
12
15
16
17
18
19
20
21
13
22
23
24
25
26
27
28
14
29
30
31
April
Wk
Mo
Tu
We
Th
Fr
Sa
Su
14
01
02
03
04
15
05
06
07
08
09
10
11
16
12
13
14
15
16
17
18
17
19
20
21
22
23
24
25
18
26
27
28
29
30
May
Wk
Mo
Tu
We
Th
Fr
Sa
Su
18
01
02
19
03
04
05
06
07
08
09
20
10
11
12
13
14
15
16
21
17
18
19
20
21
22
23
22
24
25
26
27
28
29
30
23
31
June
Wk
Mo
Tu
We
Th
Fr
Sa
Su
23
01
02
03
04
05
06
24
07
08
09
10
11
12
13
25
14
15
16
17
18
19
20
26
21
22
23
24
25
26
27
27
28
29
30
July
Wk
Mo
Tu
We
Th
Fr
Sa
Su
27
01
02
03
04
28
05
06
07
08
09
10
11
29
12
13
14
15
16
17
18
30
19
20
21
22
23
24
25
31
26
27
28
29
30
31
August
Wk
Mo
Tu
We
Th
Fr
Sa
Su
31
01
32
02
03
04
05
06
07
08
33
09
10
11
12
13
14
15
34
16
17
18
19
20
21
22
35
23
24
25
26
27
28
29
36
30
31
September
Wk
Mo
Tu
We
Th
Fr
Sa
Su
36
01
02
03
04
05
37
06
07
08
09
10
11
12
38
13
14
15
16
17
18
19
39
20
21
22
23
24
25
26
40
27
28
29
30
October
Wk
Mo
Tu
We
Th
Fr
Sa
Su
40
01
02
03
41
04
05
06
07
08
09
10
42
11
12
13
14
15
16
17
43
18
19
20
21
22
23
24
44
25
26
27
28
29
30
31
November
Wk
Mo
Tu
We
Th
Fr
Sa
Su
45
01
02
03
04
05
06
07
46
08
09
10
11
12
13
14
47
15
16
17
18
19
20
21
48
22
23
24
25
26
27
28
49
29
30
December
Wk
Mo
Tu
We
Th
Fr
Sa
Su
49
01
02
03
04
05
50
06
07
08
09
10
11
12
51
13
14
15
16
17
18
19
52
20
21
22
23
24
25
26
53
27
28
29
30
31
Applicable years
Gregorian Calendar
Leap years that begin on Thursday, along with those starting on Monday and Saturday, occur least frequently: 13 out of 97 (≈ 13.402%) total leap years in a 400-year cycle of the Gregorian calendar. Their overall occurrence is thus 3.25% (13 out of 400).
For this kind of year, the corresponding ISO year has 53 weeks, and the ISO week 10 (which begins March 1) and all subsequent ISO weeks occur earlier than in all other years, and exactly one week earlier than common years starting on Friday, for example, June 20 falls on week 24 in common years starting on Friday, but on week 25 in leap years starting on Thursday, despite falling on Sunday in both types of year. That means that moveable holidays may occur one calendar week later than otherwise possible, e.g. Gregorian Easter Sunday in week 17 in years when it falls on April 25 and which are also leap years, falling on week 16 in common years.
Gregorian leap years starting on Thursday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
17th century
1604
1632
1660
1688
18th century
1728
1756
1784
19th century
1824
1852
1880
20th century
1920
1948
1976
21st century
2004
2032
2060
2088
22nd century
2128
2156
2184
23rd century
2224
2252
2280
24th century
2320
2348
2376
25th century
2404
2432
2460
2488
26th century
2528
2556
2584
27th century
2624
2652
2680
400-year cycle
0–99
4
32
60
88
100–199
128
156
184
200–299
224
252
280
300–399
320
348
376
Julian Calendar
Like all leap year types, the one starting with 1 January on a Thursday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. 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).
Julian leap years starting on Thursday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
15th century
1428
1456
1484
16th century
1512
1540
1568
1596
17th century
1624
1652
1680
18th century
1708
1736
1764
1792
19th century
1820
1848
1876
20th century
1904
1932
1960
1988
21st century
2016
2044
2072
2100
22nd century
2128
2156
2184
Wikimedia Commons has media related to Leap years starting on Thursday and ending on Friday.
Holidays
International
Valentine's Day falls on a Saturday
The leap day (February 29) falls on a Sunday
World Day for Grandparents and the Elderly falls on July 25
All Saints' Day falls on a Monday. This is the only year when All Saints Day falls in ISO week 45. They fall in ISO week 44 in all other years.
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 Monday
Waitangi Day falls on a Friday
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. This is the only year when Saint David's Day falls in ISO week 10. They fall in ISO week 9 in all other years
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. This is the only year when Orangeman's Day falls in ISO week 29. They fall in ISO week 28 in all other years
Daylight saving ends on its latest possible date, October 31. This is the only year when Daylight Saving Time ends in ISO week 44. They end in ISO week 43 in all other years
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. This is the only year when Daylight Saving Time begins in ISO week 11. They begin in ISO week 10 in all other years.
Mother's Day falls on May 9
Victoria Day falls on its latest possible date, May 24. This is the only year when Victoria Day falls in ISO week 22. They fall in ISO week 21 in all other years. This is also the only year when Labour Day that precedes this type of year to Victoria Day in this type of year are 38 weeks apart. They are 37 weeks apart in all other years. This is also the only year when Father's Day that precedes this type of year to Victoria Day in this type of year are 344 days apart. They are 337 days apart in all other years.
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. This is the only year when Daylight Saving Time ends in ISO week 45. They end in ISO week 44 in all other years.
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 19
President's Day falls on February 16
Daylight saving begins on its latest possible date, March 14. This is the only year when Daylight Saving Time begins in ISO week 11. They begin in ISO week 10 in all other years. This is also the only type of year where Labor Day that precedes this type of year to start of Daylight Saving Time is 195 days apart. They are 188 days apart in all other years. This is also the only type of year where Grandparent's Day that precedes this type of year to start of Daylight Saving Time is 27 weeks apart. They are 26 weeks apart in all other years. This is also the only type of year where Father's Day that precedes this type of year to start of Daylight Saving Time is 39 weeks apart. They are 38 weeks apart in all other years.
Mother's Day falls on May 9
Memorial Day falls on its latest possible date, May 31. This is the only year when Memorial Day falls in ISO week 23. They fall in ISO week 22 in all other years. This is also the only type of year where Labor Day that precedes this type of year to Memorial Day in this type of year are 39 weeks apart. They are 38 weeks apart in all other years. This is also the only type of year where Grandparent's Day that precedes this type of year to Memorial Day in this type of year are 267 days apart. They are 260 days apart in all other years. This is also the only type of year where Father's Day that precedes this type of year to Memorial Day in this type of year is 351 days apart. They are 344 days apart in all other years.
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
Election Day falls on its earliest possible date, November 2. This is the only leap year to have Election Day fall during Daylight Saving Time.
Daylight saving ends on its latest possible date, November 7. This is the only year when Daylight Saving Time ends in ISO week 45. They end in ISO week 44 in all other years
Thanksgiving Day falls on November 25
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