Millennia 1st millennium BC 1st millennium AD 2nd millennium AD Centuries 1st century 2nd century 3rd century 4th century 5th century 6th century 7th century 8th century 9th century 10th century The 1st millennium was a period of time from January 1, 1 A.D. to December 31, 1000 A.D. Centuries and decades 1st century 0s10s 20s 30s40s 50s 60s70s 80s90s 2nd century 100s110s 120s 130s140s 150s 160s170s 180s190s 3rd century 200s210s 220s 230s240s 250s 260s270s 280s290s 4th century 300s310s 320s 330s340s 350s 360s370s 380s390s 5th century 400s410s 420s 430s440s 450s 460s470s 480s490s 6th century 500s510s 520s 530s540s 550s 560s570s 580s590s 7th century 600s610s 620s 630s640s 650s 660s670s 680s690s 8th century 700s710s 720s 730s740s 750s 760s770s 780s790s 9th century 800s810s 820s 830s840s 850s 860s870s 880s890s 10th century 900s910s 920s 930s940s 950s 960s970s 980s990s Millennia 1st · 2nd · 3rd · 4th · 5th · 6th · 7th · 8th · 9th · 10th · 11th 11th BC and prior · 10th BC · 9th BC · 8th BC · 7th BC · 6th BC · 5th BC · 4th BC · 3rd BC · 2nd BC · 1st BC