31 BC

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Millennium: 1st millennium BC
31 BC in various calendars
Gregorian calendar 31 BC
Ab urbe condita 723
Ancient Egypt era XXXIII dynasty, 293
- Pharaoh Cleopatra VII, 21
Ancient Greek era 187th Olympiad, year 2
Assyrian calendar 4720
Bengali calendar −623
Berber calendar 920
Buddhist calendar 514
Burmese calendar −668
Byzantine calendar 5478–5479
Chinese calendar 己丑(Earth Ox)
2666 or 2606
    — to —
庚寅年 (Metal Tiger)
2667 or 2607
Coptic calendar −314 – −313
Discordian calendar 1136
Ethiopian calendar −38 – −37
Hebrew calendar 3730–3731
Hindu calendars
 - Vikram Samvat 26–27
 - Shaka Samvat N/A
 - Kali Yuga 3070–3071
Holocene calendar 9970
Iranian calendar 652 BP – 651 BP
Islamic calendar 672 BH – 671 BH
Javanese calendar N/A
Julian calendar 31 BC
Korean calendar 2303
Minguo calendar 1942 before ROC
Nanakshahi calendar −1498
Seleucid era 281/282 AG
Thai solar calendar 512–513
The Battle of Actium

Year 31 BC was either a common year starting on Tuesday, Wednesday or Thursday or a leap year starting on Tuesday or Wednesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Tuesday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Antonius and Octavianus (or, less frequently, year 723 Ab urbe condita). The denomination 31 BC 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.


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  • Aristobulus IV