The only reason that there is no year zero, is that Europe did not even have the concept of zero until Arabic numerals were adopted in favour of Roman numerals from around the 13th or 14th century.
There is no "significance" to the value of 1/1/2000 other than all the digits clicking over. In the year 1000 nobody really noticed the year clicking over from CMXCIX to M, if too many people knew or cared what year it was , anyway.
It's just an arbitrary starting point. Why not use the Muslim, Chinese, Roman or Hebrew dating methods?

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Does earth plug a hole in Heaven or Heaven plug a hole in Earth? -Peter Gabriel