31

AD 31 in other calendars
Gregorian calendar	AD 31; XXXI
Ab urbe condita	784
Assyrian calendar	4781
Balinese saka calendar	N/A
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
Tibetan calendar	ལྕགས་ཕོ་སྟག་ལོ་; (male Iron-Tiger); 157 or −224 or −996; — to —; ལྕགས་མོ་ཡོས་ལོ་; (female Iron-Hare); 158 or −223 or −995

31 (XXXI) was a common year starting on Monday of the Julian calendar, the 31st year of the Common Era (CE) and Anno Domini (AD) designations, the 31st year of the 1st millennium, the 31st year of the 1st century, and the 2nd year of the 30s decade. As of the start of 31, the Gregorian calendar was 2 days behind the Julian calendar, which was the dominant calendar of the time.

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