耶穌幾時出世？

一位在第六世紀於北歐出生的修士，計算了納匝助人耶穌出生的年份為羅馬建城後７５４年。於是他以這一年作為公元的元年，從此沿用至今。
可是，他的計算錯誤了，因為耶穌的出生一定在大黑落德逝世之前。根據現代研究得來的資料，我們肯定：
──大黑落德在羅馬建城後750年（即公元前4年）已死；

──羅馬皇帝奧古斯都在羅 馬建城後746年（即公元前8年）才下令猶太人作戶籍登記。所以，雖然這位修士的原意想以耶穌出生的那一年作為公元元年，事實上耶穌在公元前7一5年間出生。
耶穌出生的日期和月份也無法查考。基督徒在每年12月25日慶祝聖誕節，只是源自第四世紀信徒的一種傳統。他們取用了羅馬人慶祝太陽神的日子，作為慶祝耶穌──他們心目中正義的太陽──誕生的日子。

耶穌幾時出世？12月25日囉！世事無絕對，由於曆法不同，埃塞俄比亞人要遲至西曆1月7日才慶祝聖誕節。

12th Dec,1AD

People usually use his birth to start accoarding AD,so it's 1AD.
Christmas is celebrate his birthday,and Christmas is on 25th on December.

There is no exact recorded date, it ranges from 8DC to 6AD...

c. 8 BC/BCE Birth (earliest)
c. 4 BC/BCE Herod's death
c. 6 AD/CE Birth (latest)

The most detailed accounts of Jesus' birth are contained in the Gospel of Matthew (probably written between 65 and 90 AD/CE) and the Gospel of Luke (probably written between 65 and 100 AD/CE). There is considerable debate about the details of Jesus' birth among even Christian scholars, and few scholars claim to know precisely either the year or the date of his birth or of his death.

The nativity accounts in Matthew and Luke do not mention a date or time of year for the birth of Jesus. In Western Christianity, it has been traditionally celebrated in the liturgical season of Christmastide as Christmas on 25 December, a date that can be traced as early as 330 among Roman Christians. Before then, and still today in Eastern Christianity, Jesus' birth was generally celebrated on January 6 as part of the feast of Theophany, also known as Epiphany, which commemorated not only Jesus' birth but also his baptism by John in the Jordan River and possibly additional events in Jesus' life. Some scholars note that the event described in Luke of the shepherds' activities suggest a spring or summer date for Jesus' birth. Scholars speculate that the date of the celebration was moved by the Roman Catholic Church in an attempt to replace the Roman festival of Saturnalia (or more specifically, the birthday of the pagan god Sol Invictus).[8]

In the 248th year during the Diocletian Era (based on Diocletian's ascension to the Roman throne), Dionysius Exiguus attempted to pinpoint the number of years since Jesus' birth, arriving at a figure of 753 years after the founding of Rome. Dionysius then set Jesus' birth as being December 25 1 ACN (for "Ante Christum Natum", or "before Christ (was) born"), and assigned AD 1 to the following year — thereby establishing the system of numbering years from the birth of Jesus: Anno Domini (which translates as "in the year of the Lord"). This system made the then current year 532, and almost two centuries later it won acceptance and became the established calendar in Western civilization due to its further championing by the Venerable Bede.

However, based on a lunar eclipse that Josephus reports shortly before the death of Herod the Great (who plays a major role in Matthew's account), as well as a more accurate understanding of the succession of Roman Emperors, Jesus' birth would have been some time during or before the year 4 BC/BCE. Having fewer sources and being further removed in time from the authors of the New Testament, establishing a reliable birth date now is particularly difficult. Alternatively, based on the idea that a Jupiter-Saturn conjunction was the "star" the Wise Men followed, the birth could be as early as 7BC/BCE. The Gospel of Luke and the Gospel of Matthew both place Jesus' birth under the reign of Herod the Great. Luke similarly describes the events as occurring during the governorship of Quirinius, and involving the first census of the provinces of Syria and Iudaea. Josephus places the governorship of Quirinius, and a census, in 6 AD/CE, long after the death of Herod the Great in 4 BC/BCE (which Luke refers to in Acts 5:37). Josephus also stated that Quirinius conducted a census in the thirty-seventh year since the Battle of Actium, which places the event at 6 AD/CE. Hence debate has centered over whether or not the sources can be reconciled by asserting a prior governorship of Quirinius in Syria, or if an earlier census was conducted, and if not then which source to consider in error.

Once upon a time.