Type of year
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 in the Gregorian calendar, or likewise, 2004 and 2032 in the obsolete Julian calendar, see below for more.[1]
Any leap year that starts on Monday, Wednesday or Thursday has two Friday the 13ths: those two in this leap year occur in March and November. Common years starting on Thursday share this characteristic, but also have another in February.
This is the only leap year with three occurrences of Friday the 17th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Sunday share this characteristic, in the months of February, March, and November.
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 Tuesday the 13th. Common years starting on Saturday share this characteristic, from July of the year that precedes it to September in that type of year.
Calendars
Calendar for any leap year starting on Wednesday, presented as common in many English-speaking areas |
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| 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 Wednesday (dominical letter ED) |
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| January | | Wk | Mo | Tu | We | Th | Fr | Sa | Su | 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 | | | | | | February | | Wk | Mo | Tu | We | Th | Fr | Sa | Su | 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 | | | | | | 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
Leap years that begin on Wednesday, along with those starting 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. Thus, their overall occurrence is 3.5% (14 out of 400).
For this kind of year, the corresponding ISO year has 53 weeks.
400-year cycle 0–99 | 20 | 48 | 76 | |
100–199 | 116 | 144 | 172 | |
200–299 | 212 | 240 | 268 | 296 |
300–399 | 308 | 336 | 364 | 392 |
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).
Wikimedia Commons has media related to Leap years starting on Wednesday and ending on Thursday.