The current year is recognized based on Jesus’ birth due to the widespread adoption of the Gregorian calendar, which is anchored in the Anno Domini (AD) system. This system was developed by Dionysius Exiguus in the 6th century. He sought to replace the Diocletian era, which was named after the Roman Emperor Diocletian, with a calendar system centered on the estimated year of Jesus Christ’s birth. Dionysius aimed to base the calendar on a significant Christian event rather than the reign of a Roman Emperor who had persecuted Christians.
His system marked the year of Jesus’ birth as 1 AD (Anno Domini, Latin for “In the Year of Our Lord”) and the years before that as BC (Before Christ). This calendar became widely used in Europe, especially after the adoption of the Gregorian calendar by Pope Gregory XIII in 1582, which refined the Julian calendar to more accurately reflect the solar year.
The widespread use of this calendar, and thus its dating system, spread through European influence and colonization. Today, it’s recognized globally for secular and practical reasons, although alternative calendars are used in various cultural and religious contexts. The terms CE (Common Era) and BCE (Before Common Era) are now often used as secular alternatives to AD and BC.