Leap year starting on Wednesday

A leap year starting on Wednesday is any year with 366 days (i.e. it includes 29 February) that begins on Wednesday 1 January and ends on Thursday 31 December. Its dominical letters hence are ED. The most recent year of such kind was 2020 and the next one will be 2048, or likewise, 2004 and 2032 in the obsolete Julian calendar, see below for more. Any leap year that starts on a Monday, on a Wednesday or on a Thursday has two Friday the 13ths. This leap year contains two Friday the 13ths in March and November. Common years starting on Thursday share this characteristic, but also have another in February. This leap year also has the shortest gap between Leap Day (February 29) and the start of Daylight Saving Time in the US (March 8), only by 8 days. In this leap year, the leap day, U.S. Independence Day, and Halloween are on a Saturday, Memorial Day is on its earliest possible date, May 25, Labor Day is on its latest possible date, September 7, Thanksgiving is on November 26, and Christmas is on a Friday. Also like a common year starting on Thursday, this leap year is the only one where Memorial Day and Labor Day are not 14 weeks (98 days) apart: they are 15 weeks (105 days) apart in this leap year.

Calendars

Calendar for any leap year starting on Wednesday,
presented as common in many English-speaking areas

ISO 8601-conformant calendar with week numbers for
any leap year starting on Wednesday (dominical letter ED)2020

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	January
01			01	02	03	04	05
02	06	07	08	09	10	11	12
03	13	14	15	16	17	18	19
04	20	21	22	23	24	25	26
05	27	28	29	30	31

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	February
05						01	02
06	03	04	05	06	07	08	09
07	10	11	12	13	14	15	16
08	17	18	19	20	21	22	23
09	24	25	26	27	28	29

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	March
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	April
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	May
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	June
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	July
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	August
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	September
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	October
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	November
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

Wk	Mo	Tu	We	Th	Fr	Sa	Su
	December
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

Leap years that begin on Wednesday, like those that start on Tuesday, occur at a rate of approximately 14.43% (14 out of 97) of all total leap years in a 400-year cycle of the Gregorian calendar. Their overall occurrence is thus 3.5% (14 out of 400).

For this kind of year, the corresponding ISO year has 53 weeks.

Gregorian leap years starting on Wednesday
Decade	1st	2nd	3rd	4th	5th	7th	8th	10th
17th century			1620		1648		1676
18th century		1716			1744		1772
19th century		1812		1840		1868		1896
20th century	1908			1936		1964		1992
21st century			2020		2048		2076
22nd century		2116			2144		2172
23rd century		2212		2240		2268		2296
24th century	2308			2336		2364		2392
25th century			2420		2448		2476
26th century		2516			2544		2572

Gregorian year types per leap cycle by Dominical letter (DL) and Doomsday (DD)
1 Jan	Count	Ratio	31 Dec	DL	DD	Count	Ratio	31 Dec	DL	DD	Count	Ratio
Year starts			Common years					Leap years
Sun	58	14.50 %	Sun	A	Tue	43	10.75 %	Mon	AG	Wed	15	3.75 %
Sat	56	14.00 %	Sat	B	Mon	43	10.75 %	Sun	BA	Tue	13	3.25 %
Fri	58	14.50 %	Fri	C	Sun	43	10.75 %	Sat	CB	Mon	15	3.75 %
Thu	57	14.25 %	Thu	D	Sat	44	11.00 %	Fri	DC	Sun	13	3.25 %
Wed	57	14.25 %	Wed	E	Fri	43	10.75 %	Thu	ED	Sat	14	3.50 %
Tue	58	14.50 %	Tue	F	Thu	44	11.00 %	Wed	FE	Fri	14	3.50 %
Mon	56	14.00 %	Mon	G	Wed	43	10.75 %	Tue	GF	Thu	13	3.25 %
∑	400	100.0 %				303	75.75 %				97	24.25 %

Julian Calendar

Like all leap year types, the one starting with 1 January on a Wednesday 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 Wednesday
Decade	1st	2nd	3rd	4th	5th	6th	7th	8th	9th	10th
15th century		1416			1444			1472		1500
16th century			1528			1556			1584
17th century		1612		1640			1668			1696
18th century			1724			1752		1780
19th century	1808			1836			1864			1892
20th century		1920			1948			1976
21st century	2004			2032		2060			2088
22nd century		2116			2144			2172		2200