For the calendar era, see Common Era. For the fictional date system, see Common Year (Greyhawk).
A common year is a calendar year with 365 days, as distinguished from a leap year, which has 366 days. More generally, a common year is one without intercalation. The Gregorian calendar (like the earlier Julian calendar) employs both common years and leap years to keep the calendar aligned with the tropical year, which does not contain an exact number of days.
The common year of 365 days has 52 weeks and one day, hence a common year always begins and ends on the same day of the week (for example, January 1 and December 31 will fall on a Wednesday in 2025) and the year following a common year will start on the subsequent day of the week. In common years, February has exactly four weeks, so March begins on the same day of the week. November also begins on this day. For example, February 2025 begins on a Saturday, so March will begin on a Saturday as well. November will follow the same characteristic.
Each common year has 179 even-numbered days and 186 odd-numbered days.
In the Gregorian calendar, 303 out of every 400 years are common years. By comparison, in the Julian calendar, 300 out of every 400 years are common years, and in the Revised Julian calendar (used by Greece) 682 out of every 900 years are common years.
A commonyear is a calendar year with 365 days, as distinguished from a leap year, which has 366 days. More generally, a commonyear is one without intercalation...
A commonyear starting on Sunday is any non-leap year (i.e. a year with 365 days) that begins on Sunday, 1 January, and ends on Sunday, 31 December. Its...
A commonyear starting on Monday is any non-leap year (i.e., a year with 365 days) that begins on Monday, 1 January, and ends on Monday, 31 December....
A commonyear starting on Thursday is any non-leap year (i.e. a year with 365 days) that begins on Thursday, 1 January, and ends on Thursday, 31 December...
A commonyear starting on Saturday is any non-leap year (i.e. a year with 365 days) that begins on Saturday, 1 January, and ends on Saturday, 31 December...
A commonyear starting on Wednesday is any non-leap year (a year with 365 days) that begins on Wednesday, 1 January, and ends on Wednesday, 31 December...
A commonyear starting on Friday is any non-leap year (i.e. a year with 365 days) that begins on Friday, 1 January, and ends on Friday, 31 December. Its...
A commonyear starting on Tuesday is any non-leap year (i.e. a year with 365 days) that begins on Tuesday, 1 January, and ends on Tuesday, 31 December...
A century commonyear is a commonyear in the Gregorian calendar that is divisible by 100 but not by 400. Like all common years, these years do not get...
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calendar, or modern calendar, presents its calendar year to be either a commonyear of 365 days or a leap year of 366 days, as do the Julian calendars. For the...
compared to a commonyear. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. Since astronomical...
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a commonyear starting on Friday of the Gregorian calendar, the 2027th year of the Common Era (CE) and Anno Domini (AD) designations, the 27th year of...
a commonyear starting on Monday of the Gregorian calendar, the 2029th year of the Common Era (CE) and Anno Domini (AD) designations, the 29th year of...
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was a commonyear starting on Saturday of the Gregorian calendar and a commonyear starting on Thursday of the Julian calendar, the 1898th year of the...
commonyear starting on Sunday of the Gregorian calendar and a commonyear starting on Friday of the Julian calendar, the 1837th year of the Common Era...
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