1420 (MCDXX) was a leap year starting on Monday of the Julian calendar, the 1420th year of the Common Era (CE) and Anno Domini (AD) designations, the 420th year of the 2nd millennium, the 20th year of the 15th century, and the 1st year of the 1420s decade. As of the start of 1420, the Gregorian calendar was 9 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium: 2nd millennium
Centuries: 14th century15th century16th century
Decades: 1390s  1400s  1410s  – 1420s –  1430s  1440s  1450s
Years: 1417 1418 141914201421 1422 1423
1420 in other calendars
Gregorian calendar1420
MCDXX
Ab urbe condita2173
Armenian calendar869
ԹՎ ՊԿԹ
Assyrian calendar6170
Balinese saka calendar1341–1342
Bengali calendar827
Berber calendar2370
English Regnal yearHen. 5 – 8 Hen. 5
Buddhist calendar1964
Burmese calendar782
Byzantine calendar6928–6929
Chinese calendar己亥(Earth Pig)
4116 or 4056
    — to —
庚子年 (Metal Rat)
4117 or 4057
Coptic calendar1136–1137
Discordian calendar2586
Ethiopian calendar1412–1413
Hebrew calendar5180–5181
Hindu calendars
 - Vikram Samvat1476–1477
 - Shaka Samvat1341–1342
 - Kali Yuga4520–4521
Holocene calendar11420
Igbo calendar420–421
Iranian calendar798–799
Islamic calendar822–823
Japanese calendarŌei 27
(応永27年)
Javanese calendar1334–1335
Julian calendar1420
MCDXX
Korean calendar3753
Minguo calendar492 before ROC
民前492年
Nanakshahi calendar−48
Thai solar calendar1962–1963
Tibetan calendar阴土猪年
(female Earth-Pig)
1546 or 1165 or 393
    — to —
阳金鼠年
(male Iron-Rat)
1547 or 1166 or 394

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