42 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
42 BC in various calendars
Gregorian calendar42 BC
XLII BC
Ab urbe condita712
Ancient Egypt eraXXXIII dynasty, 282
- PharaohCleopatra VII, 10
Ancient Greek era184th Olympiad, year 3
Assyrian calendar4709
Balinese saka calendarN/A
Bengali calendar−634
Berber calendar909
Buddhist calendar503
Burmese calendar−679
Byzantine calendar5467–5468
Chinese calendar戊寅年 (Earth Tiger)
2656 or 2449
    — to —
己卯年 (Earth Rabbit)
2657 or 2450
Coptic calendar−325 – −324
Discordian calendar1125
Ethiopian calendar−49 – −48
Hebrew calendar3719–3720
Hindu calendars
 - Vikram Samvat15–16
 - Shaka SamvatN/A
 - Kali Yuga3059–3060
Holocene calendar9959
Iranian calendar663 BP – 662 BP
Islamic calendar683 BH – 682 BH
Javanese calendarN/A
Julian calendar42 BC
XLII BC
Korean calendar2292
Minguo calendar1953 before ROC
民前1953年
Nanakshahi calendar−1509
Seleucid era270/271 AG
Thai solar calendar501–502
Tibetan calendar阳土虎年
(male Earth-Tiger)
85 or −296 or −1068
    — to —
阴土兔年
(female Earth-Rabbit)
86 or −295 or −1067
First Battle of Philippi (October 3, 42 BC)
Second Battle of Philippi (October 23, 42 BC)

Year 42 BC was either a common year starting on Monday, Tuesday or Wednesday or a leap year starting on Tuesday (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 Lepidus and Plancus (or, less frequently, year 712 Ab urbe condita). The denomination 42 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.