| 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: | 48 BC 47 BC 46 BC - 45 BC - 44 BC 43 BC 42 BC |
| 45 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 45 BC |
| Ab urbe condita | 709 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1888 – -1887 |
| Berber calendar | 906 |
| Buddhist calendar | 500 |
| Burmese calendar | -682 |
| Byzantine calendar | 5464 – 5465 |
| Chinese calendar | 乙亥年 (2592/2652) — to —
丙子年(2593/2653) |
| Coptic calendar | -328 – -327 |
| Ethiopian calendar | -52 – -51 |
| Hebrew calendar | 3716 – 3717 |
| Hindu calendars | |
| - Vikram Samvat | 11 – 12 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3057 – 3058 |
| Holocene calendar | 9956 |
| Iranian calendar | 666 BP – 665 BP |
| Islamic calendar | 686 BH – 685 BH |
| Japanese calendar | |
| Korean calendar | 2289 |
| Thai solar calendar | 499 |
Year 45 BC was the year the Julian calendar went into effect. According to this calendar, it was a leap year starting on Friday (link will display the full calendar).
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