With a dash of math, know the day of the week for any date on the calendar.

The calendar is a mathematical object with regular patterns, such as leap years happening every four years. This results in your birthday increasing by one or two days as you go from one year to the next in a very predictable pattern. Using easy mnemonics, and by adding three numbers together -- derived from the month, date, and year -- the total yields the day of the week. This is a practical application of something called modular arithmetic -- in this case, we're adding and subtracting mod 7 because there are 7 days in a week.

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PRODUCTION CREDITS

Videography & Production
Ari Daniel

Original Footage
© WGBH Educational Foundation 2016

MEDIA CREDITS

Music
APM

Additional Imagery
Flickr/Dustin Liebenow

Special Thanks
Brunswick Junior High School
Peter Stevens' Class

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