Why would there be a year zero? If I have six eggs, they are eggs 1-6. The is no egg zero. It's a meaningless concept.
At some point, someone/ones decided that a particular day was to be day one of year one. At the end of year 1, 1 year had elapsed. At the end of year 1999, i.e. the start of year 2000, 1999 years had elapsed. So that was a year too early to celebrate the passing of 2 millennia. At the end of year 2000, 2000 years had elapsed. QED.
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