45 BC

45 BC in various calendars
Gregorian calendar	45 BC; XLV BC
Ab urbe condita	709
Ancient Egypt era	XXXIII dynasty, 279
- Pharaoh	Cleopatra VII, 7
Ancient Greek era	183rd Olympiad, year 4
Assyrian calendar	4706
Balinese saka calendar	N/A
Bengali calendar	−637
Berber calendar	906
Buddhist calendar	500
Burmese calendar	−682
Byzantine calendar	5464–5465
Chinese calendar	乙亥年 (Wood Pig); 2653 or 2446; — to —; 丙子年 (Fire Rat); 2654 or 2447
Coptic calendar	−328 – −327
Discordian calendar	1122
Ethiopian calendar	−52 – −51
Hebrew calendar	3716–3717
Hindu calendars
- Vikram Samvat	12–13
- Shaka Samvat	N/A
- Kali Yuga	3056–3057
Holocene calendar	9956
Iranian calendar	666 BP – 665 BP
Islamic calendar	686 BH – 685 BH
Javanese calendar	N/A
Julian calendar	45 BC; XLV BC
Korean calendar	2289
Minguo calendar	1956 before ROC; 民前1956年
Nanakshahi calendar	−1512
Seleucid era	267/268 AG
Thai solar calendar	498–499
Tibetan calendar	阴木猪年; (female Wood-Pig); 82 or −299 or −1071; — to —; 阳火鼠年; (male Fire-Rat); 83 or −298 or −1070

Millennium:	1st millennium BC
Centuries:	2nd century BC; 1st century BC ; 1st century;
Decades:	60s BC; 50s BC; 40s BC ; 30s BC; 20s BC;
Years:	48 BC; 47 BC; 46 BC; 45 BC ; 44 BC; 43 BC; 42 BC;

Year 45 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on Friday or Saturday (link will display the full calendar) (the sources differ, see leap year error for further information) and the first year of the Julian calendar and a leap year starting on Friday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Caesar without Colleague (or, less frequently, year 709 Ab urbe condita). The denomination 45 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.

Events

Consuls: Gaius Julius Caesar, without colleague.
January 1 – The Julian calendar takes effect as the civil calendar of the Roman Empire, establishing January 1 as the new date of the new year.
March 17 – Civil War: In his last victory, Julius Caesar defeats the Pompeian forces of Titus Labienus and Pompey the younger in the Battle of Munda. Labienus dies in battle, Pompey the younger is executed, but Sextus Pompey escapes to take command of the remnants of the Pompeian fleet.
The veterans of Julius Caesar's Legions Legio XIII Gemina and Legio X Equestris demobilized. The veterans of the 10th legion are settled in Narbo, while those of the 13th are given somewhat better lands in Italia itself.
Caesar is named dictator for life.
Caesar probably writes his Commentaries in this year.

February – Tullia, daughter of Cicero (b. 79 BC or 78 BC)
March 17
- Titus Labienus, killed in the battle of Munda (b. c. 100 BC)
- Publius Attius Varus, killed in the battle of Munda
April 12 – Gnaeus Pompeius, son of Pompey the Great, executed after the battle of Munda (b. c. 75 BC)
December 31 – Quintus Fabius Maximus, consul suffectus 45 BC
Nigidius Figulus, Roman scholar (b. 98 BC)