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Dates would always occur on the same day of the week if years always had 364 days and we continued to use seven - day weeks. As it is now, fifty - two seven - day weeks equals three hundred sixty four days, and non - leap years are three hundred sixty - five days.

The one extra day means that every non - leap year, all dates are one day of the week advanced compared to the preceding year. In the case of leap years, dates after February 28 are advanced two days compared to the previous year.

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15y ago

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