We are currently in the 21st century. The 21st century began on January 1, 2001, and will end on December 31, 2100

. This counting is because there was no year zero in the Gregorian calendar; the first century started at year 1 and ended at year 100, the second century from 101 to 200, and so forth. Thus, the 21st century covers the years 2001 through 2100

. Since the current year is 2025, we are well within the 21st century.