40 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
40 BC in various calendars
Gregorian calendar40 BC
XL BC
Ab urbe condita714
Ancient Egypt eraXXXIII dynasty, 284
- PharaohCleopatra VII, 12
Ancient Greek era185th Olympiad (victor
Assyrian calendar4711
Balinese saka calendarN/A
Bengali calendar−632
Berber calendar911
Buddhist calendar505
Burmese calendar−677
Byzantine calendar5469–5470
Chinese calendar庚辰年 (Metal Dragon)
2658 or 2451
    — to —
辛巳年 (Metal Snake)
2659 or 2452
Coptic calendar−323 – −322
Discordian calendar1127
Ethiopian calendar−47 – −46
Hebrew calendar3721–3722
Hindu calendars
 - Vikram Samvat17–18
 - Shaka SamvatN/A
 - Kali Yuga3061–3062
Holocene calendar9961
Iranian calendar661 BP – 660 BP
Islamic calendar681 BH – 680 BH
Javanese calendarN/A
Julian calendar40 BC
XL BC
Korean calendar2294
Minguo calendar1951 before ROC
民前1951年
Nanakshahi calendar−1507
Seleucid era272/273 AG
Thai solar calendar503–504
Tibetan calendar阳金龙年
(male Iron-Dragon)
87 or −294 or −1066
    — to —
阴金蛇年
(female Iron-Snake)
88 or −293 or −1065

Year 40 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on Thursday or Friday (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 Friday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Calvinus and Pollio (or, less frequently, year 714 Ab urbe condita). The denomination 40 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.