Compléter Measurements of TimeVersion en ligne Measurements of time including year, decade, century, and millennium. par Stephanie B 1 century after 12 365 16th 17th millennium BC There are 100 years in a . A year has days , or months . There are 1 , 000 years in a . The term refers to the time before the birth of Jesus Christ . The term AD refers to the time the birth of Jesus Christ . The years 1501 - 1600 refers to the century . The years 1601 - 1700 refers to the century .