{"id":71,"canonical_url":"https://www.kudos365.com/today-in-history/events/45bce-jan-1--71","name":"45 BCE, January 1","year":-45,"era":"BCE","month":1,"day":1,"url":"https://www.kudos365.com/today-in-history/events/45bce-jan-1--71","iso-date":"-0045-01-01","precision":"year-month-day","description":"\u003cp\u003eThe Julian Calendar takes effect, under the direction of Julius Caesar, replacing the traditional Roman calendar which had been introduced around the seventh century B.C. and followed the lunar cycle. It introduced a solar year of 365 days with a leap year every fourth year to keep the calendar aligned with the seasons.\u0026nbsp;\u003c/p\u003e","additional_details":"\u003cp\u003eThe Julian calendar was a successful reform that remained the standard in the Roman Empire and the Western world for over 1,600 years until it was replaced by the more accurate Gregorian calendar in the 16th century.\u003c/p\u003e","photo":"","created_at":"2025-03-11T13:59:52-07:00","updated_at":"2026-01-01T11:39:01-08:00","breadcrumbs":{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"January History","item":"https://www.kudos365.com/today-in-history/january"},{"@type":"ListItem","position":2,"name":"January 1","item":"https://www.kudos365.com/today-in-history/january-1"}]},"schema":{"@context":"https://schema.org","@type":"Thing","@id":"https://www.kudos365.com/today-in-history/events/45bce-jan-1--71#eventK365","name":"45 BCE, January 1","headline":"The Julian Calendar takes effect, under the direction of Julius Caesar, replacing the traditional Roman... - 45 BCE","description":"The Julian Calendar takes effect, under the direction of Julius Caesar, replacing the traditional Roman calendar which had been introduced around the seventh...","url":"https://www.kudos365.com/today-in-history/events/45bce-jan-1--71","additionalType":"HistoricalEvent","inLanguage":"en","datePublished":"2025-03-11T13:59:52-07:00","dateModified":"2026-01-01T11:39:01-08:00","publisher":{"@id":"https://www.kudos365.com/#organizationK365"},"temporalCoverage":"-0045-01-01","isPartOf":[{"@id":"https://www.kudos365.com/#websiteK365"},{"@type":"CollectionPage","@id":"https://www.kudos365.com/today-in-history/january","name":"What Happened in January History"},{"@type":"CollectionPage","@id":"https://www.kudos365.com/today-in-history/january-1#pageK365","name":"What Happened on January 1"}]}}