How many days? How many hours? How many minutes? How many seconds are there from 2011 to 2021?
201220162020 three year leap year a year 366 days, the rest of the year 365 days, then 365 × 7 + 3 × 366 = 3653 days, a day 24 hours: 3653 × 24 = 87672 hours, an hour 60 minutes: 87672 × 60 = 5260320 minutes, a minute 60 seconds: 5260320 × 60 = 315619200 seconds, so 2011 to 2021 10 years a total of 3653 days, 8767