|Centuries:||15th century – 16th century – 17th century|
|Decades:||1550s 1560s 1570s – 1580s – 1590s 1600s 1610s|
|Years:||1579 1580 1581 – 1582 – 1583 1584 1585|
Gregorian calendar switch: The year 1582 (MDLXXXII) involved conversion to the Gregorian calendar. It had only 355 days. It began as a common year starting on Monday, in accordance with the Julian calendar. It continued as normal through Thursday, October 4. But the next day, it became October 15 (like a common year starting on Friday) in Italy, Poland, Portugal, and Spain. Other countries continued to use the Julian calendar, switching over to the Gregorian in later years.