1582 (MDLXXXII) was a common year starting on Monday of the Julian calendar, the 1582nd year of the Common Era (CE) and Anno Domini (AD) designations, the 582nd year of the 2nd millennium, the 82nd year of the 16th century, and the 3rd year of the 1580s decade. As of the start of 1582, the Gregorian calendar was 10 days ahead of the Julian calendar, which had previously been the universally accepted calendar in Christian nations. However, this year saw the beginning of the Gregorian Calendar switch, when the Papal bull known as Inter gravissimas introduced the Gregorian calendar, adopted by Spain, Portugal, the Polish–Lithuanian Commonwealth and most of present-day Italy from the start. In these countries, the year continued as normal until Thursday, October 4. However, the next day became Friday, October 15 (like a common year starting on Friday), in those countries (France followed two months later, letting Sunday, December 9 be followed by Monday, December 20). Other countries continued using the Julian calendar for decades or, in some cases, centuries.

Millennium: 2nd millennium
Centuries: 15th century16th century17th century
Decades: 1550s  1560s  1570s  – 1580s –  1590s  1600s  1610s
Years: 1579 1580 158115821583 1584 1585
1582 in other calendars
Gregorian calendar1582
Ab urbe condita2335
Armenian calendar1031
Assyrian calendar6332
Balinese saka calendar1503–1504
Bengali calendar989
Berber calendar2532
English Regnal year24 Eliz. 1 – 25 Eliz. 1
Buddhist calendar2126
Burmese calendar944
Byzantine calendar7090–7091
Chinese calendar辛巳(Metal Snake)
4278 or 4218
    — to —
壬午年 (Water Horse)
4279 or 4219
Coptic calendar1298–1299
Discordian calendar2748
Ethiopian calendar1574–1575
Hebrew calendar5342–5343
Hindu calendars
 - Vikram Samvat1638–1639
 - Shaka Samvat1503–1504
 - Kali Yuga4682–4683
Holocene calendar11582
Igbo calendar582–583
Iranian calendar960–961
Islamic calendar989–990
Japanese calendarTenshō 10
Javanese calendar1501–1502
Julian calendarGregorian minus 10 days
Korean calendar3915
Minguo calendar330 before ROC
Nanakshahi calendar114
Thai solar calendar2124–2125
Tibetan calendar阴金蛇年
(female Iron-Snake)
1708 or 1327 or 555
    — to —
(male Water-Horse)
1709 or 1328 or 556

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