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Every year has 52 full weeks. In addition, ordinary years have one more day, and leap years have two more days.
From Jan 1 2000 until Jan 1 2013, 13 years, there are 4749 days. 13 years can also consist of 4748 days (Jan 1 1999 through Jan 1 2012) or 4747 days (Jan 1 2099 through Jan 1 2112). It depends on the number of leap year days there are in the 13 years you are counting (4745 plus the number of leap year days).
There are 365 days in a year. (Actually 365.25 days to be more precise, that's why we have leap years every four years.)
Last prime of the 20th Century was 1999. Last prime of the 21st Century will be 2099.