How many weeks are an a year?

Answer 1

52 weeks + 1 day in a common year

52 weeks + 2 days in a leap year

This is the reason why a certain date (in most cases), will be one weekday later the following year, if a year was exactly 52 weeks (364 days) long, every date will land on the same weekday each year.

Answer 2

52 weeks in year