According to the Gregorian calendar, it's the year 2010. According to the Chinese calendar, it's the year 4695. According to the Hebrew calendar, it's the year 5771. According to the Islamic calendar, it's the year 1431. The only reason why the Gregorian calendar is used most often is because that's the one that was already in use by the US and Europe, who each produced a lot of the technology we use today. And the only reason they used it, was because centuries ago the dominant religion was Christianity. When you conquer lands and make colonies, you bring your calendar with you too. Christian scholars today don't even place the alleged birth of Jesus of Nazareth at 1 CE any more. That's one of the reasons why we don't even use the abbreviations "BC" and "AD" anymore, but the more accurate CE (Common Era) and BCE (Before Common Era). I've seen some Christians make the embarrassingly stupid argument that our use of this year system means that we have to all believe Christians. Well, we've named the days of the week after Pagan deities (Wednesday = Wodin, Thursday = Thor, Friday = Freya, etc.). So by that logic, only Pagans should use the days of the week names.