We go by the Gregorian calendar, which is a slight adjustment of the Julian calendar created by Gaius Julius Caesar in about 46 B.C. The Roman calendar in use at the time only had about 350 days, and Caesar got sick of the calendar lagging behind the seasons. We date everything from the birth of Jesus as deduced by fifth century monk who wasn’t very good at math, apparently. Even though he lived less than 500 years later and had access to records which laid out a reasonable chronology, he came up with a date for the birth of Jesus which would have been somewhere between 4 and eight years off.
We use the Gregorian calendar.
This website might help: http://www.wordiq.com/definition/Gregorian_Calendar
We go by the Gregorian calendar, which is a slight adjustment of the Julian calendar created by Gaius Julius Caesar in about 46 B.C. The Roman calendar in use at the time only had about 350 days, and Caesar got sick of the calendar lagging behind the seasons. We date everything from the birth of Jesus as deduced by fifth century monk who wasn’t very good at math, apparently. Even though he lived less than 500 years later and had access to records which laid out a reasonable chronology, he came up with a date for the birth of Jesus which would have been somewhere between 4 and eight years off.