One year has almost 52 weeks and one day (unless it is a leap year). Basically, one common year has 365 days and there are 7 days in a week. So, to attend the total number of weeks per year, we need to find the ratio between the number of days (365) in a year to the number of days (7) in a week.
i.e. 365 / 7 = 52 weeks and 1 day.
Now, if it is a leap year, then it has 366 days. So, divide 366 by 7 and you will get 52 weeks and two days.
One year has approximatly 52 weeks. One calendar common year has 365 days: 1 common year = 365 days = (365 days) / (7 days/week) = 52.143 weeks = 52 weeks + 1 day. One calendar leap year occures every 4 years, except for years that are divisable by 100 and not divisable by 400.
One calendar leap year has 366 days, when February has 29 days: 1 leap year = 366 days = (366 days) / (7 days/week) = 52.286 weeks = 52 weeks + 2 days. This is viable to anyone, thus we can calculate easily the days, hours, weeks, seconds, and etc.