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The third millennium is the third period of one thousand years of the Gregorian calendar. As the millennium currently in progress, only its first decade, the 2000s, can be the subject of the historian's attention, the remaining part of the 21st century (such as the predicted stagnation of world population at some 10 billion in the 2050s) and longer-term trends being the province of futures studies.
Start and end dates There are two ranges of dates which are recognised as the third millennium, depending on the start date, namely: January 1 2001 - December 31 3000 In the sense of astronomical year numbering or the ISO 8601 standard, both of which precede Year 1 with Year 0 (which is not considered part of the first 1st millennium, or for those who start counting their calendar from January 1 1, then the third millennium began on January 1, 2001 and will end on December 31, 3000 in the sense of the Gregorian calendar or other calendars based on the BC/AD system of calendar eras. January 1 2000 & December 31 2999 The majority of the celebrations for the start of the third millennium occurred at midnight on December 31 1999 / January 1 2000. The first decade of the new millennium (see below) contains the year 2000. Events
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