Year 42 BC was either a common year starting on Monday, Tuesday or Wednesday or a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Lepidus and Plancus.

Millennium: 1st millennium BC
Centuries: 2nd century BC1st century BC1st century
Decades: 70s BC  60s BC  50s BC  – 40s BC –  30s BC  20s BC  10s BC
Years: 45 BC 44 BC 43 BC42 BC41 BC 40 BC 39 BC
42 BC in other calendars
Gregorian calendar42 BC
XLI 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(Earth Tiger)
2655 or 2595
    — to —
己卯年 (Earth Rabbit)
2656 or 2596
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
XLI 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

Events

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Births

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for more information, see Category:42 BC births.

Deaths

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for more information, see Category:42 BC deaths.