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A comment on Calculate the day of the week for any date in your head. Parent comment

Re:Calculate the day of the week for any date in your head by jolmg on Wednesday January 01, 2020 @12:53PM (#21929312)
To add to your comment, being divisable by 400 is also the same thing as throwing away the 00 and checking the remaining is divisable by 4. One explanation is just a rephrasing of the other for the exact same method.
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