What is the solution to the revolving century puzzle?

The revolving century puzzle typically involves a riddle or mathematical challenge concerning the transition from one century to the next. A common version of this puzzle asks how many times a specific event occurs, such as the year 2000 being part of the 20th century. The solution clarifies that the 21st century actually began in the year 2001 and will end in 2100, while the 20th century spanned from 1901 to 2000. Thus, understanding the start and end points of each century is key to solving the puzzle.