As of 2014, it is currently the 21st century. A century is defined as 100 years, and the years of the Gregorian calendar began with the year 1 A.D. Therefore, the 21st century started on January 1, 2001, and will end on December 31, 2100.
The 21st century's official start was at the Prime Meridian, which is located at the Royal Observatory in Greenwich, England. The year 2000 is considered the final year of the 20th century. the 22nd century will begin on January 1, 2101.
In addition to a new century, January 1, 2001, was the beginning of the third millennium, an era of 1000 years. The third millennium will last until December 31, 3000.