Weeks

This article details various mathematical algorithms to calculate the day of the week for any particular date in the past or future. There are a number of other algorithms to do this, including, for example, the Doomsday Algorithm, but they are all variants of each other, simply using different rules to achieve the same result. ...more on Wikipedia about "Calculating the day of the week"

Various reforms to the Gregorian calendar currently used by most of the world have been proposed. ...more on Wikipedia about "Calendar reform"

This is the calendar for any common year starting on Friday ( dominical letter C), for example, 2010. ...more on Wikipedia about "Common year starting on Friday"

This is the calendar for a common year starting on Monday ( dominical letter G), e.g. 2007, 2001, 1990, 1979, 1973... ...more on Wikipedia about "Common year starting on Monday"

This is the calendar for any common year starting on Saturday ( dominical letter B) e.g. 2005. ...more on Wikipedia about "Common year starting on Saturday"

This is the calendar for any common year starting on Sunday ( dominical letter A). For example, 2006. ...more on Wikipedia about "Common year starting on Sunday"

This is the calendar for any common year starting on Thursday ( dominical letter D). ...more on Wikipedia about "Common year starting on Thursday"

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This is the calendar for a common year starting on Tuesday ( dominical letter F), e.g. 2013, 2002, 1991, 1985, 1974, 1963... ...more on Wikipedia about "Common year starting on Tuesday"

This is the calendar for a common year starting on Wednesday ( dominical letter E), e.g. 2003. ...more on Wikipedia about "Common year starting on Wednesday"

The days of the year are sometimes designated letters A, B, C, D, E, F and G in a cycle of 7 as an aid for finding the day of week of a given calendar date and in calculating Easter. These letters are known as dominical letters. ...more on Wikipedia about "Dominical letter"

The doomsday rule or doomsday algorithm is a way of calculating the day of the week of a given date. It is perpetually accurate since the Gregorian calendar moves in cycles of 400 years. It makes use of the fact that, in each year, certain dates are all on the same day of the week. ...more on Wikipedia about "Doomsday rule"

This is the calendar for any leap year starting on Friday ( dominical letter CB). ...more on Wikipedia about "Leap year starting on Friday"

This is the calendar for any leap year starting on Monday ( dominical letter GF). ...more on Wikipedia about "Leap year starting on Monday"

This is the calendar for any leap year starting on Saturday ( dominical letter BA), e.g. 2000. ...more on Wikipedia about "Leap year starting on Saturday"

This is the calendar for any leap year starting on Sunday ( dominical letter AG), e.g. 2012. ...more on Wikipedia about "Leap year starting on Sunday"

This is the calendar for any leap year starting on Thursday ( dominical letter DC), e.g. 2004. ...more on Wikipedia about "Leap year starting on Thursday"

This is the calendar for any leap year starting on Tuesday ( dominical letter FE), e.g. 2008. ...more on Wikipedia about "Leap year starting on Tuesday"

This is the calendar for any leap year starting on Wednesday ( dominical letter ED), e.g. 1992. ...more on Wikipedia about "Leap year starting on Wednesday"

A long weekend is a term used in Western countries, particularly in North America, to denote a weekend that is at least three days long (a three-day weekend), due to a holiday falling on either the Friday or Monday. In the United Kingdom these would be termed a bank holiday weekend. ...more on Wikipedia about "Long weekend"

A week is a unit of time longer than a day and shorter than a month. In most modern calendars, including the Gregorian calendar, the week is a period of seven days, making it the longest conventionally used time unit that contains a fixed number of days. Although having no direct astronomical basis, it is widely used as a unit of time. ...more on Wikipedia about "Week"

Weekdays are the days of the week which are not part of the weekend, i.e. the workweek. In most countries the weekdays are then: ...more on Wikipedia about "Weekday"

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The weekend is a part of the week lasting one or two days in which most paid workers do not work. This is a time for leisure and recreation, and/or for religious activities. ...more on Wikipedia about "Weekend"

Zeller's congruence is an algorithm devised by Julius Christian Johannes Zeller to calculate the day of the week for any calendar date. ...more on Wikipedia about "Zeller's congruence"

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