AD 31

Millennium:	1st millennium
Centuries:	1st century BC 1st century 2nd century
Decades:	10s 20s 30s 40s 50s
Years:	28 29 30 AD 31 32 33 34

AD 31 in various calendars
Gregorian calendar	AD 31 XXXI
Ab urbe condita	784
Assyrian calendar	4781
Bengali calendar	−562
Berber calendar	981
Buddhist calendar	575
Burmese calendar	−607
Byzantine calendar	5539–5540
Chinese calendar	庚寅年 (Metal Tiger) 2727 or 2667 — to — 辛卯年 (Metal Rabbit) 2728 or 2668
Coptic calendar	−253 – −252
Discordian calendar	1197
Ethiopian calendar	23–24
Hebrew calendar	3791–3792
Hindu calendars
- Vikram Samvat	87–88
- Shaka Samvat	N/A
- Kali Yuga	3131–3132
Holocene calendar	10031
Iranian calendar	591 BP – 590 BP
Islamic calendar	609 BH – 608 BH
Javanese calendar	N/A
Julian calendar	AD 31 XXXI
Korean calendar	2364
Minguo calendar	1881 before ROC 民前1881年
Nanakshahi calendar	−1437
Seleucid era	342/343 AG
Thai solar calendar	573–574
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AD 31 (XXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberius and Sejanus (or, less frequently, year 784 Ab urbe condita). The denomination AD 31 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.