Common year starting on Friday

{{calendar|year=2021|show_year=off|title=Calendar for any common year starting on Friday,
presented as common in many English-speaking areas}}

{{calendar|year=2021|show_year=off|format=iso|row=3|zero=0|title=ISO 8601-conformant calendar with week numbers for
any common year starting on Friday (dominical letter C)}}

This is the only year type where the nth "Doomsday" (this year Sunday) is not in ISO week n; it is in ISO week n-1.

In the (currently used) Gregorian calendar, alongside Sunday, Monday, Wednesday 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 Friday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400.

For this kind of year, the ISO week 10 (which begins March 8) and all subsequent ISO weeks occur later than in all other years, and exactly one week later than Leap years starting on Thursday. Also, the ISO weeks in January and February occur later than all other common years, but leap years starting on Friday share this characteristic in January and February, until ISO week 8.

In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). 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 4, 15 and 26 of the cycle are common years beginning on Friday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Friday.

• Valentine's Day falls on a Sunday
• World Day for Grandparents and the Elderly falls on July 25
• Halloween falls on a Sunday. This is the only year when Halloween falls in ISO week 43. They fall in ISO week 44 in all other years.
• Christmas Day falls on a Saturday

• Epiphany falls on a Wednesday
• Candlemas falls on a Tuesday
• Saint Joseph's Day falls on a Friday
• The Annunciation of Jesus falls on a Thursday
• The Nativity of John the Baptist falls on a Thursday
• The Solemnity of Saints Peter and Paul falls on a Tuesday
• The Transfiguration of Jesus falls on a Friday
• The Assumption of Mary falls on a Sunday
• The Exaltation of the Holy Cross falls on a Tuesday
• All Saints' Day falls on a Monday
• All Souls' Day falls on a Tuesday
• The Feast of Christ the King falls on November 21 (or on its latest possible date of October 31 in versions of the calendar between 1925 and 1962)
• The First Sunday of Advent falls on November 28
• The Immaculate Conception falls on a Wednesday
• Gaudete Sunday falls on December 12
• Rorate Sunday falls on December 19

• Australia Day falls on a Tuesday
• Waitangi Day falls on a Saturday
• Daylight saving ends on April 4
• ANZAC Day falls on a Sunday, and in some years coincides with Easter Sunday falling on its latest possible date
• Mother's Day falls on May 9
• Father's Day falls on September 5
• Daylight saving begins on September 26 in New Zealand and October 3 in Australia

• Saint David's Day falls on a Monday
• Mother's Day falls on March 7, March 14, March 21, March 28 or on its latest possible date of April 4
• Daylight saving begins on March 28
• Saint Patrick's Day falls on a Wednesday
• Saint George's Day falls on a Friday, and in some years coincides with Good Friday falling on its latest possible date
• Father's Day falls on June 20
• Orangeman's Day falls on a Monday
• Daylight saving ends on its latest possible date, October 31
• Guy Fawkes Night falls on a Friday
• Saint Andrew's Day falls on a Tuesday

• Daylight saving begins on its latest possible date, March 14
• Mother's Day falls on May 9
• Victoria Day falls on its latest possible date, May 24
• Father's Day falls on June 20
• Canada Day falls on a Thursday
• Labour Day falls on September 6
• Thanksgiving Day falls on October 11
• Daylight saving ends on its latest possible date, November 7

• Martin Luther King Jr. Day falls on January 18
• President's Day falls on its earliest possible date, February 15
• Daylight saving begins on its latest possible date, March 14
• Mother's Day falls on May 9
• Memorial Day falls on its latest possible date, May 31
• Juneteenth falls on a Saturday
• Father's Day falls on June 20
• Independence Day falls on a Sunday
• Labor Day falls on September 6
• Grandparents' Day falls on September 12
• Columbus Day falls on October 11
• Daylight saving ends on its latest possible date, November 7
• Thanksgiving Day falls on November 25

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{{List of calendars}}

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Category:Gregorian calendar

Category:Julian calendar

Category:Friday