It would be nice if all the systems for time matched, but unfortunately, they do not. Atheists, most scientists, and those who do not believe the Bible, generally believe that our present world began between 3,114 B.C. (the Mayans) and 158 trillion years ago (Hindu "50 years of Brahma"). To the Jew, our present year is 5772-5773. Based upon the dating of a Christian Bishop by the name of James Ussher (1581 – 1656), who, using the life-spans given in the Bible, determined that Creation occurred in 4004 B.C., our calendar year of A.D. 2012 would make the world 6,016 years old.
According to the "experts," the Mayan Calendar predicts the end of the world today! Unfortunately, the "experts" are apparently unfamiliar with how the Mayan Calendar works. What has been interpreted as the "end of the world," is merely the end of an epoch. The Mayan's believed that every 5,125 years, a major change occurred in the Universe. Hence, on December 21, 2012, the world, as we know it, would end, and a new world would begin.
It is absolutely amazing to me that a culture, which for all practical purposes ceased to exist about one thousand years ago, could be considered such great prophets of the future. They obviously didn't foresee their own demise, so why do so many believe that their prediction of today being the world's last day? The strangest thing is, many professing Christians believe it! Unbelievable!
Jesus said, "But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father" (Mk. 13:32). The context is the Lord's Second Coming. Before that occurs, the Church will be removed via the Rapture (Jn. 14:1-3; 1 Thes. 4:13-18; etc.), and the seven years of the Tribulation must happen (Dan. 9:24-27; Rev. 6 - 18; etc.). Even after He returns, there will be at least a thousand years before there is an end to the world as we know it (2 Pet. 3:13; Rev. 20:1 - 21:1; etc.).
But do not relax. Just because the world will continue to exist, that does not mean you will! There is no way of knowing if we will live another day; today may actually be our last day! That is why the Word says, "behold, now is the accepted time; behold, now is the day of salvation" (2 Cor. 6:2)!
The world will not end today, but your world may! Are you ready?