A leap year starting on Saturday is any year with 366 days (i.e. it includes 29 February) that begins on Saturday, 1 January, and ends on Sunday, 31 December. Its dominical letters hence are BA. The most recent year of such kind was 2000, and the next one will be 2028 in the Gregorian calendar or, likewise 2012 and 2040 in the obsolete Julian calendar. In the Gregorian calendar, years divisible by 400 are always leap years starting on Saturday. The most recent such occurrence was 2000 and the next one will be 2400, see below for more.
Any leap year that starts on Saturday has only one Friday the 13th: the only one in this leap year occurs in October. Common years starting on Sunday share this characteristic, but also have another in January. From August of the common year preceding that year until October in this type of year is also the longest period (14 months) that occurs without a Friday the 13th. Common years starting on Tuesday share this characteristic, from July of the year that precedes it to September in that type of year.
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 Sunday is considered the first day of the week, and also the only type of year to contain 53 full weekends.
This year has four months (January, April, July and October) which begin on a weekend-day. This is also the only type of leap year in which the first and last day of the calendar year fall on weekend-days.
Calendars
Calendar for any leap year starting on Saturday, 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 Saturday (dominical letter BA)
January
Wk
Mo
Tu
We
Th
Fr
Sa
Su
52
01
02
01
03
04
05
06
07
08
09
02
10
11
12
13
14
15
16
03
17
18
19
20
21
22
23
04
24
25
26
27
28
29
30
05
31
February
Wk
Mo
Tu
We
Th
Fr
Sa
Su
05
01
02
03
04
05
06
06
07
08
09
10
11
12
13
07
14
15
16
17
18
19
20
08
21
22
23
24
25
26
27
09
28
29
March
Wk
Mo
Tu
We
Th
Fr
Sa
Su
09
01
02
03
04
05
10
06
07
08
09
10
11
12
11
13
14
15
16
17
18
19
12
20
21
22
23
24
25
26
13
27
28
29
30
31
April
Wk
Mo
Tu
We
Th
Fr
Sa
Su
13
01
02
14
03
04
05
06
07
08
09
15
10
11
12
13
14
15
16
16
17
18
19
20
21
22
23
17
24
25
26
27
28
29
30
May
Wk
Mo
Tu
We
Th
Fr
Sa
Su
18
01
02
03
04
05
06
07
19
08
09
10
11
12
13
14
20
15
16
17
18
19
20
21
21
22
23
24
25
26
27
28
22
29
30
31
June
Wk
Mo
Tu
We
Th
Fr
Sa
Su
22
01
02
03
04
23
05
06
07
08
09
10
11
24
12
13
14
15
16
17
18
25
19
20
21
22
23
24
25
26
26
27
28
29
30
July
Wk
Mo
Tu
We
Th
Fr
Sa
Su
26
01
02
27
03
04
05
06
07
08
09
28
10
11
12
13
14
15
16
29
17
18
19
20
21
22
23
30
24
25
26
27
28
29
30
31
31
August
Wk
Mo
Tu
We
Th
Fr
Sa
Su
31
01
02
03
04
05
06
32
07
08
09
10
11
12
13
33
14
15
16
17
18
19
20
34
21
22
23
24
25
26
27
35
28
29
30
31
September
Wk
Mo
Tu
We
Th
Fr
Sa
Su
35
01
02
03
36
04
05
06
07
08
09
10
37
11
12
13
14
15
16
17
38
18
19
20
21
22
23
24
39
25
26
27
28
29
30
October
Wk
Mo
Tu
We
Th
Fr
Sa
Su
39
01
40
02
03
04
05
06
07
08
41
09
10
11
12
13
14
15
42
16
17
18
19
20
21
22
43
23
24
25
26
27
28
29
44
30
31
November
Wk
Mo
Tu
We
Th
Fr
Sa
Su
44
01
02
03
04
05
45
06
07
08
09
10
11
12
46
13
14
15
16
17
18
19
47
20
21
22
23
24
25
26
48
27
28
29
30
December
Wk
Mo
Tu
We
Th
Fr
Sa
Su
48
01
02
03
49
04
05
06
07
08
09
10
50
11
12
13
14
15
16
17
51
18
19
20
21
22
23
24
52
25
26
27
28
29
30
31
Applicable years
Gregorian Calendar
Leap years that begin on Saturday, along with those starting on Monday and Thursday, 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).
Gregorian leap years starting on Saturday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
16th century
prior to first adoption (proleptic)
1600
17th century
1628
1656
1684
18th century
1724
1752
1780
19th century
1820
1848
1876
20th century
1916
1944
1972
2000
21st century
2028
2056
2084
22nd century
2124
2152
2180
23rd century
2220
2248
2276
24th century
2316
2344
2372
2400
25th century
2428
2456
2484
400-year cycle
0–99
0
28
56
84
100–199
124
152
180
200–299
220
248
276
300–399
316
344
372
Julian Calendar
Like all leap year types, the one starting with 1 January on a Saturday 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 Saturday
Decade
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
10th
15th century
1424
1452
1480
16th century
1508
1536
1564
1592
17th century
1620
1648
1676
18th century
1704
1732
1760
1788
19th century
1816
1844
1872
1900
20th century
1928
1956
1984
21st century
2012
2040
2068
2096
22nd century
2124
2152
2180
Holidays
International
Valentine's Day falls on a Monday
The leap day (February 29) falls on a Tuesday
World Day for Grandparents and the Elderly falls on July 23
The Feast of Christ the King falls on its latest possible date, November 26 (or on October 29 in versions of the calendar between 1925 and 1962)
The First Sunday of Advent falls on its latest possible date, December 3
The Immaculate Conception falls on a Friday
Gaudete Sunday falls on its latest possible date, December 17
Rorate Sunday falls on its latest possible date, December 24
Australia and New Zealand
Australia Day falls on a Wednesday
Waitangi Day falls on a Sunday
Daylight saving ends on April 2
ANZAC Day falls on a Tuesday
Mother's Day falls on its latest possible date, May 14
Father's Day falls on September 3
Daylight saving begins on its earliest possible date, September 24 in New Zealand and October 1 in Australia
British Isles
Saint David's Day falls on a Wednesday
Mother's Day falls on March 5, March 12, March 19, March 26 or April 2
Daylight saving begins on March 26
Saint Patrick's Day falls on a Friday
Saint George's Day falls on a Sunday
Father's Day falls on June 18
Orangeman's Day falls on a Wednesday
Daylight saving ends on October 29
Guy Fawkes Night falls on a Sunday
Saint Andrew's Day falls on a Thursday
Canada
Daylight saving begins on March 12
Mother's Day falls on its latest possible date, May 14
Victoria Day falls on May 22
Father's Day falls on June 18
Canada Day falls on a Saturday
Labour Day falls on September 4
Thanksgiving Day falls on October 9
Daylight saving ends on November 5
Denmark
The Constitution Day falls on a Monday
Germany
The reunification falls on a Tuesday
United States
Martin Luther King Jr. Day falls on January 17
President's Day falls on its latest possible date, February 21
Daylight saving begins on March 12
Mother's Day falls on its latest possible date, May 14
Memorial Day falls on May 29
Father's Day falls on June 18
Juneteenth falls on a Monday
Independence Day falls on a Tuesday
Labor Day falls on September 4
Grandparents' Day falls on September 10
Columbus Day falls on October 9
Daylight saving ends on November 5
Election Day falls on November 7
Thanksgiving Day falls on November 23
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