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 2024 and 2052 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. Similarly, Common years starting on Wednesday also have three Friday the 13th's within a three month (13-week) gap between them, the former two being in the common year preceding that type of leap year in September and December, and the latter being in that type of year in March.

Calendars

Applicable years Gregorian Calendar Leap years that begin on Sunday, along with those starting on Friday, occur most frequently: 15 of the 97 (≈ 15.46%) total leap years in a 400-year cycle of the Gregorian calendar. Thus, their overall occurrence is 3.75% (15 out of 400).

+ Gregorian leap years starting on Sunday Decade 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 16th century prior to first adoption (proleptic) 158417th century1612164016681696 18th century 1708 1736 1764 1792 19th century 1804 1832 1860 1888 20th century 1928 1956 1984 21st century 2012 2040 2068 2096 22nd century 2108 2136 2164 2192 23rd century 2204 2232 2260 2288 24th century 2328 2356 2384 25th century 2412 2440 2468 2496 26th century 2508 2536 2564 2592 27th century 2604 2632 2660 2688

+ 400-year cycle 0–99 12 40 68 96 100–199 108 136 164 192 200–299 204 232 260 288 300–399 328 356 384

Julian Calendar Like all leap year types, the one starting with 1 January on a Sunday 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, it will also repeat after 700 years, i.e., 25 cycles. The formula gives the year's position in the cycle ((year + 8) mod 28) + 1).

+ Julian leap years starting on Sunday Decade 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 15th century 1408 1436 1464 1492 16th century 1520 1548 1576 17th century 1604 1632 1660 1688 18th century 1716 1744 1772 1800 19th century 1828 1856 1884 20th century 1912 1940 1968 1996 21st century 2024 2052 2080 22nd century 2108 2136 2164 2192

Holidays

International Valentine's Day falls on a Tuesday The leap day (February 29) falls on a Wednesday World Day for Grandparents and the Elderly falls on its earliest possible date, July 22 Halloween falls on a Wednesday Christmas Day falls on a Tuesday

Roman Catholic Solemnities Epiphany falls on a Friday Candlemas falls on a Thursday Saint Joseph's Day falls on a Monday The Annunciation of Jesus falls on a Sunday The Nativity of John the Baptist falls on a Sunday The Solemnity of Saints Peter and Paul falls on a Friday The Transfiguration of Jesus falls on a Monday The Assumption of Mary falls on a Wednesday The Exaltation of the Holy Cross falls on a Friday All Saints' Day falls on a Thursday All Souls' Day falls on a Friday The Feast of Christ the King falls on November 25 (or on October 28 in versions of the calendar between 1925 and 1962) The First Sunday of Advent falls on December 2 The Immaculate Conception falls on a Saturday Gaudete Sunday falls on December 16 Rorate Sunday falls on December 23

Australia and New Zealand Australia Day falls on a Thursday Waitangi Day falls on a Monday Daylight saving ends on its earliest possible date, April 1 ANZAC Day falls on a Wednesday Mother's Day falls on May 13 Father's Day falls on September 2 Daylight saving begins on its latest possible date, September 30 in New Zealand and October 7 in Australia – this is the only leap year where the period of standard time over the winter months lasts 26 weeks in New Zealand and 27 weeks in Australia (in all other leap years, it lasts only 25 weeks in New Zealand and 26 weeks in Australia)

British Isles Saint David's Day falls on a Thursday Mother's Day falls on March 4, March 11, March 18, March 25 or April 1 Saint Patrick's Day falls on a Saturday Daylight saving begins on its earliest possible date, March 25 Saint George's Day falls on a Monday Father's Day falls on June 17 Orangeman's Day falls on a Thursday Daylight saving ends on October 28 Guy Fawkes Night falls on a Monday Saint Andrew's Day falls on a Friday

Canada Daylight saving begins on March 11 Mother's Day falls on May 13 Victoria Day falls on May 21 Father's Day falls on June 17 Canada Day falls on a Sunday Labour Day falls on September 3 Thanksgiving Day falls on its earliest possible date, October 8 Daylight saving ends on November 4

United States Martin Luther King Jr. Day falls on January 16 President's Day falls on February 20 Daylight saving begins on March 11 Mother's Day falls on May 13 Memorial Day falls on May 28 Father's Day falls on June 17 Juneteenth falls on a Tuesday Independence Day falls on a Wednesday Labor Day falls on September 3 Grandparents' Day falls on September 9 Columbus Day falls on its earliest possible date, October 8 Daylight saving ends on November 4 Election Day falls on November 6 Thanksgiving Day falls on its earliest possible date, November 22

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