learn.howToCalculate

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A day-of-week calculator determines what day of the week any given date falls on. The Doomsday algorithm (Conway) or modular arithmetic can compute this for any date in the Gregorian calendar.

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1. 1Use the formula: (d + m + y + y/4 − y/100 + y/400 + c) mod 7
2. 2d=day, m=month code, y=year, c=century adjustment
3. 3Or simply count forward/backward from a known reference date
4. 4JavaScript: new Date("YYYY-MM-DD").getDay() → 0=Sunday, 6=Saturday

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