1591 (MDXCI) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1591st year of the Common Era (CE) and Anno Domini (AD) designations, the 591st year of the 2nd millennium, the 91st year of the 16th century, and the 2nd year of the 1590s decade. As of the start of 1591, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.

Millennium: 2nd millennium
Centuries: 15th century16th century17th century
Decades: 1560s  1570s  1580s  – 1590s –  1600s  1610s  1620s
Years: 1588 1589 159015911592 1593 1594
1591 in other calendars
Gregorian calendar1591
MDXCI
Ab urbe condita2344
Armenian calendar1040
ԹՎ ՌԽ
Assyrian calendar6341
Balinese saka calendar1512–1513
Bengali calendar998
Berber calendar2541
English Regnal year33 Eliz. 1 – 34 Eliz. 1
Buddhist calendar2135
Burmese calendar953
Byzantine calendar7099–7100
Chinese calendar庚寅(Metal Tiger)
4287 or 4227
    — to —
辛卯年 (Metal Rabbit)
4288 or 4228
Coptic calendar1307–1308
Discordian calendar2757
Ethiopian calendar1583–1584
Hebrew calendar5351–5352
Hindu calendars
 - Vikram Samvat1647–1648
 - Shaka Samvat1512–1513
 - Kali Yuga4691–4692
Holocene calendar11591
Igbo calendar591–592
Iranian calendar969–970
Islamic calendar999–1000
Japanese calendarTenshō 19
(天正19年)
Javanese calendar1511–1512
Julian calendarGregorian minus 10 days
Korean calendar3924
Minguo calendar321 before ROC
民前321年
Nanakshahi calendar123
Thai solar calendar2133–2134
Tibetan calendar阳金虎年
(male Iron-Tiger)
1717 or 1336 or 564
    — to —
阴金兔年
(female Iron-Rabbit)
1718 or 1337 or 565

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