Leap year starting on Friday


A leap year starting on Friday is any year with 366 days that begins on Friday 1 January and ends on Saturday 31 December. Its dominical letters hence are CB, such as the years 1808, 1836, 1864, 1892, 1904, 1932, 1960, 1988, 2016, 2044, 2072, 2112, 2140, 2168, 2196, and 2208 in the Gregorian calendar or, likewise, 2000 and 2028 in the obsolete Julian calendar. Any leap year that starts on Tuesday, Friday or Saturday has only one Friday the 13th; the only Friday the 13th in this leap year occurs in May. Common years starting on Saturday share this characteristic.

Calendars

Applicable years

Gregorian Calendar

Leap years that begin on Friday, along with those that start on Sunday, occur most frequently: 15 out of the 97 total leap years in a 400-year cycle of the Gregorian calendar. Thus, the overall occurrence is thus 3.75%.
Decade1st2nd3rd4th5th6th7th8th9th10th
17th century161616441672
18th century1712174017681796
19th century1808183618641892
20th century1904193219601988
21st century201620442072
22nd century2112214021682196

Julian Calendar

Like all leap year types, the one starting with 1 January on a Friday 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 + 1).
Decade1st2nd3rd4th5th6th7th8th9th10th
15th century1412144014681496
16th century152415521580
17th century1608163616641692
18th century172017481776
19th century1804183218601888
20th century1916194419722000
21st century202820562084
22nd century2112214021682196