ABSTRACT
The following formula gives the day of the week for the Gregorian calendar (i.e., for any date after 1582): https://www.w3.org/1998/Math/MathML"> W ≡ d + 2.6 m - 0.2 + Y + Y 4 + C 4 - 2 C mod 7 $$ W \equiv \left( {d + \left\lfloor {2.6m - 0.2} \right\rfloor + Y + \left\lfloor {\frac{Y}{4}} \right\rfloor + \left\lfloor {\frac{C}{4}} \right\rfloor - 2C} \right)\,\,\,\,\,\,\,\,\,\left( {\bmod \,7} \right) $$ https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315154978/83261826-4289-4c28-b58a-1e19e9646e13/content/math10_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/>
