| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC - 1st century BC - 1st century |
| Decades: | 70s BC 60s BC 50s BC - 40s BC - 30s BC 20s BC 10s BC |
| Years: | 45 BC 44 BC 43 BC - 42 BC - 41 BC 40 BC 39 BC |
| 42 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 42 BC |
| Ab urbe condita | 712 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1885 – -1884 |
| Berber calendar | 909 |
| Buddhist calendar | 503 |
| Burmese calendar | -679 |
| Byzantine calendar | 5467 – 5468 |
| Chinese calendar | 戊寅年 (2595/2655) — to —
己卯年(2596/2656) |
| Coptic calendar | -325 – -324 |
| Ethiopian calendar | -49 – -48 |
| Hebrew calendar | 3719 – 3720 |
| Hindu calendars | |
| - Vikram Samvat | 14 – 15 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3060 – 3061 |
| Holocene calendar | 9959 |
| Iranian calendar | 663 BP – 662 BP |
| Islamic calendar | 683 BH – 682 BH |
| Japanese calendar | |
| Korean calendar | 2292 |
| Thai solar calendar | 502 |
Year 42 BC was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.
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