A leap year starting on Sunday is any year with 366 days (i.e. it includes 29 February) that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG. The most recent year of such kind was 2012, and the next one will be 2040 in the Gregorian calendar or, likewise 2024 and 2052 in the obsolete Julian calendar.
This is the only leap year with three occurrences of Friday the 13th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Thursday share this characteristic, in the months of February, March, and November.
Additionally, these types of years are the only ones which contain 54 different calendar weeks (2 partial, 52 in full) in areas of the world where Monday is considered the first day of the week.
This year has five months (January, April, July, September and December) which begin on a weekend-day. This is the greatest possible number of months to begin on a weekend-day in a given year; this is the only kind of year in which this occurs.
Calendars
Calendar for any leap year starting on Sunday, 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 Sunday (dominical letter AG)
January
Wk
Mo
Tu
We
Th
Fr
Sa
Su
52
01
01
02
03
04
05
06
07
08
02
09
10
11
12
13
14
15
03
16
17
18
19
20
21
22
04
23
24
25
26
27
28
29
05
30
31
February
Wk
Mo
Tu
We
Th
Fr
Sa
Su
05
01
02
03
04
05
06
06
07
08
09
10
11
12
07
13
14
15
16
17
18
19
08
20
21
22
23
24
25
26
09
27
28
29
March
Wk
Mo
Tu
We
Th
Fr
Sa
Su
09
01
02
03
04
10
05
06
07
08
09
10
11
11
12
13
14
15
16
17
18
12
19
20
21
22
23
24
25
13
26
27
28
29
30
31
April
Wk
Mo
Tu
We
Th
Fr
Sa
Su
13
01
14
02
03
04
05
06
07
08
15
09
10
11
12
13
14
15
16
16
17
18
19
20
21
22
17
23
24
25
26
27
28
29
18
30
May
Wk
Mo
Tu
We
Th
Fr
Sa
Su
18
01
02
03
04
05
06
19
07
08
09
10
11
12
13
20
14
15
16
17
18
19
20
21
21
22
23
24
25
26
27
22
28
29
30
31
June
Wk
Mo
Tu
We
Th
Fr
Sa
Su
22
01
02
03
23
04
05
06
07
08
09
10
24
11
12
13
14
15
16
17
25
18
19
20
21
22
23
24
26
25
26
27
28
29
30
July
Wk
Mo
Tu
We
Th
Fr
Sa
Su
26
01
27
02
03
04
05
06
07
08
28
09
10
11
12
13
14
15
29
16
17
18
19
20
21
22
30
23
24
25
26
27
28
29
31
30
31
August
Wk
Mo
Tu
We
Th
Fr
Sa
Su
31
01
02
03
04
05
32
06
07
08
09
10
11
12
33
13
14
15
16
17
18
19
34
20
21
22
23
24
25
26
35
27
28
29
30
31
September
Wk
Mo
Tu
We
Th
Fr
Sa
Su
35
01
02
36
03
04
05
06
07
08
09
37
10
11
12
13
14
15
16
38
17
18
19
20
21
22
23
39
24
25
26
27
28
29
30
October
Wk
Mo
Tu
We
Th
Fr
Sa
Su
40
01
02
03
04
05
06
07
41
08
09
10
11
12
13
14
42
15
16
17
18
19
20
21
43
22
23
24
25
26
27
28
44
29
30
31
November
Wk
Mo
Tu
We
Th
Fr
Sa
Su
44
01
02
03
04
45
05
06
07
08
09
10
11
46
12
13
14
15
16
17
18
47
19
20
21
22
23
24
25
48
26
27
28
29
30
December
Wk
Mo
Tu
We
Th
Fr
Sa
Su
48
01
02
49
03
04
05
06
07
08
09
50
10
11
12
13
14
15
16
51
17
18
19
20
21
22
23
52
24
25
26
27
28
29
30
01
31
Applicable years
Gregorian Calendar
Leap years that begin on Sunday, along with those starting on Friday, occur most frequently: 15 of the 97 (≈ 15.46%) total leap years in a 400-year cycle of the Gregorian calendar. Thus, their overall occurrence is 3.75% (15 out of 400).
Gregorian leap years starting on Sunday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
16th century
prior to first adoption (proleptic)
1584
17th century
1612
1640
1668
1696
18th century
1708
1736
1764
1792
19th century
1804
1832
1860
1888
20th century
1928
1956
1984
21st century
2012
2040
2068
2096
22nd century
2108
2136
2164
2192
23rd century
2204
2232
2260
2288
24th century
2328
2356
2384
25th century
2412
2440
2468
2496
26th century
2508
2536
2564
2592
27th century
2604
2632
2660
2688
400-year cycle
0–99
12
40
68
96
100–199
108
136
164
192
200–299
204
232
260
288
300–399
328
356
384
Julian Calendar
Like all leap year types, the one starting with 1 January on a Sunday 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, it will also repeat after 700 years, i.e., 25 cycles. The formula gives the year's position in the cycle ((year + 8) mod 28) + 1).
Julian leap years starting on Sunday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
15th century
1408
1436
1464
1492
16th century
1520
1548
1576
17th century
1604
1632
1660
1688
18th century
1716
1744
1772
1800
19th century
1828
1856
1884
20th century
1912
1940
1968
1996
21st century
2024
2052
2080
22nd century
2108
2136
2164
2192
Holidays
International
Valentine's Day falls on a Tuesday
The leap day (February 29) falls on a Wednesday
World Day for Grandparents and the Elderly falls on its earliest possible date, July 22
The Feast of Christ the King falls on November 25 (or on October 28 in versions of the calendar between 1925 and 1962)
The First Sunday of Advent falls on December 2
The Immaculate Conception falls on a Saturday
Gaudete Sunday falls on December 16
Rorate Sunday falls on December 23
Australia and New Zealand
Australia Day falls on a Thursday
Waitangi Day falls on a Monday
Daylight saving ends on its earliest possible date, April 1
ANZAC Day falls on a Wednesday
Mother's Day falls on May 13
Father's Day falls on September 2
Daylight saving begins on its latest possible date, September 30 in New Zealand and October 7 in Australia – this is the only leap year where the period of standard time over the winter months lasts 26 weeks in New Zealand and 27 weeks in Australia (in all other leap years, it lasts only 25 weeks in New Zealand and 26 weeks in Australia)
British Isles
Saint David's Day falls on a Thursday
Mother's Day falls on March 4, March 11, March 18, March 25 or April 1
Saint Patrick's Day falls on a Saturday
Daylight saving begins on its earliest possible date, March 25
Saint George's Day falls on a Monday
Father's Day falls on June 17
Orangeman's Day falls on a Thursday
Daylight saving ends on October 28
Guy Fawkes Night falls on a Monday
Saint Andrew's Day falls on a Friday
Canada
Daylight saving begins on March 11
Mother's Day falls on May 13
Victoria Day falls on May 21
Father's Day falls on June 17
Canada Day falls on a Sunday
Labour Day falls on September 3
Thanksgiving Day falls on its earliest possible date, October 8
Daylight saving ends on November 4
United States
Martin Luther King Jr. Day falls on January 16
President's Day falls on February 20
Daylight saving begins on March 11
Mother's Day falls on May 13
Memorial Day falls on May 28
Father's Day falls on June 17
Juneteenth falls on a Tuesday
Independence Day falls on a Wednesday
Labor Day falls on September 3
Grandparents' Day falls on September 9
Columbus Day falls on its earliest possible date, October 8
Daylight saving ends on November 4
Election Day falls on November 6
Thanksgiving Day falls on its earliest possible date, November 22
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