There are 52 weeks in a year. This is true for both the Gregorian calendar, which is the most widely used calendar system today, and the ISO 8601 calendar, which is an international standard. Each week consists of seven days, resulting in a total of 52 weeks in a year. However, there is a small exception in leap years when there is an extra day (February 29th), which means those years have 52 weeks and 1 day.


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