leap year starting on Sunday and ending on Monday

Abstract is: A leap year starting on Sunday is any year with 366 days (i.e. it includes 29 February) that begins on Sunday, 1 January, and ends on Monday, 31 December. Its dominical letters hence are AG. The most recent year of such kind was 2012 and the next one will be 2040 in the Gregorian calendar or, likewise, 1996 and 2024 in the obsolete Julian calendar. This is the only leap year with three occurrences of Friday the 13th: those three in this leap year occur three months (13 weeks) apart: in January, April, and July. Common years starting on Thursday share this characteristic, in the months of February, March, and November. In this leap year, Martin Luther King Jr. Day is on January 16; Valentine's Day is on a Tuesday; Presidents' Day is on February 20; the leap day is on a Wednesday; Saint Patrick's Day is on a Saturday; Memorial Day is on May 28; Juneteenth is on a Tuesday; U.S. Independence Day is on a Wednesday; Labor Day is on September 3; Columbus Day is on its earliest possible date, October 8; Election Day in the USA is on November 6th; Halloween is on a Wednesday; Veterans Day is on a Sunday; Thanksgiving is on its earliest possible date, November 22; and Christmas is on a Tuesday. In this type of year, all dates (except 29 February) fall on their respective weekdays 58 times in the 400 year Gregorian calendar cycle. Leap years starting on Friday share this characteristic.