45 BC

45 BC in various
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

Fourth consulship of Gaius Julius Caesar (without colleague).^[1]
January 1 – The Julian calendar takes effect as the civil calendar of the Roman Empire, establishing a solar calendar that is based on the Egyptian calendar of the day.
executed, but Sextus Pompey
escapes to take command of the remnants of the Pompeian fleet.