Leap year starting on Saturday

A leap year starting on Saturday is any year with 366 days 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 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 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 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.

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 total leap years in a 400-year cycle of the Gregorian calendar. Their overall occurrence is thus 3.25%.

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 + 1).

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