How many full weeks are there in a year?

A year has 52 weeks and 1 day most years. This is because the Gregorian calendar has 365 days in a year. 52 weeks * 7 days = 364 days. 364 days + 1 day = 365 days. This means that there are 52 full weeks in a year.

But, every 4 years, there is an extra day in February. This means that there are 52 weeks and 2 days in a leap year. Leap years occur almost every 4 years. Leap years don't occur for years that are divisible by 100, but not divisible by 400. For example, the year 2000 was a leap year, but the year 1900 was not.