Gregorian Calendar

In the (currently used) Gregorian calendar, alongside Sunday, Monday, Friday or Saturday, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-three common years per cycle or exactly 10.75% start on a Wednesday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.

Julian Calendar

In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). A leap year has two adjoining dominical letters (one for January and February and the other for March to December, as 29 February has no letter). This sequence occurs exactly once within a cycle, and every common letter thrice.

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). Years 2, 8 and 19 of the cycle are common years beginning on Wednesday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Wednesday.

International

• • Valentine's Day falls on a Friday
  • World Day for Grandparents and the Elderly falls on July 27
  • Halloween falls on a Friday
  • Christmas Day falls on a Thursday

Roman Catholic Solemnities

• • Epiphany falls on a Monday
  • Candlemas falls on a Sunday
  • Saint Joseph's Day falls on a Wednesday
  • The Annunciation of Jesus falls on a Tuesday
  • The Nativity of John the Baptist falls on a Tuesday
  • The Solemnity of Saints Peter and Paul falls on a Sunday
  • The Transfiguration of Jesus falls on a Wednesday
  • The Assumption of Mary falls on a Friday
  • The Exaltation of the Holy Cross falls on a Sunday
  • All Saints' Day falls on a Saturday
  • All Souls' Day falls on a Sunday
  • The Feast of Christ the King falls on November 23 (or on October 26 in versions of the calendar between 1925 and 1962)
  • The First Sunday of Advent falls on November 30
  • The Immaculate Conception falls on a Monday
  • Gaudete Sunday falls on December 14
  • Rorate Sunday falls on December 21

Australia and New Zealand

• • Australia Day falls on a Sunday
  • Waitangi Day falls on a Thursday
  • Daylight saving ends on April 6
  • ANZAC Day falls on a Friday
  • Mother's Day falls on May 11
  • Father's Day falls on its latest possible date, September 7
  • Daylight saving begins on September 28 in New Zealand and October 5 in Australia

British Isles

• • Saint David's Day falls on a Saturday
  • Mother's Day falls on March 2, March 9, March 16, March 23 or March 30
  • Saint Patrick's Day falls on a Monday
  • Daylight saving begins on March 30
  • Saint George's Day falls on a Wednesday
  • Father's Day falls on its earliest possible date, June 15
  • Orangeman's Day falls on a Saturday
  • Daylight saving ends on October 26
  • Guy Fawkes Night falls on a Wednesday
  • Saint Andrew's Day falls on a Sunday

Canada

• • Daylight saving begins on March 9
  • Mother's Day falls on May 11
  • Victoria Day falls on May 19
  • Father's Day falls on its earliest possible date, June 15
  • Canada Day falls on a Tuesday
  • Labour Day falls on its earliest possible date, September 1
  • Thanksgiving Day falls on October 13
  • Daylight saving ends on November 2

United States

• • Martin Luther King Jr. Day falls on January 20
  • President's Day falls on February 17
  • Daylight saving begins on March 9
  • Mother's Day falls on May 11
  • Memorial Day falls on May 26
  • Father's Day falls on its earliest possible date, June 15
  • Juneteenth falls on a Thursday
  • Independence Day falls on a Friday
  • Labor Day falls on its earliest possible date, September 1
  • Grandparents' Day falls on its earliest possible date, September 7
  • Columbus Day falls on October 13
  • Daylight saving ends on November 2
  • Thanksgiving Day falls on November 27