Perpetual Calendar, 1753–2100
A perpetual calendar lets you find the day of the week for any date in any year. Because January 1 may fall on any of the seven days of the week and may be a leap or nonleap year, 14 different calendars are possible. The number next to each year corresponds to one of the 14 calendars. Calendar 4 will be used in 2014; calendar 5 will be used in 2015; calendar 13 will be used in 2016; calendar 1 will be used in 2017.
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