The second millennium.
The 2nd Millennium began in the year 1001.
From the 1st of January 1001 to the 31st of December 2000.
The year zero was the year before the first millennium.
2017 is in the third millennium AD.
Two millennia and one year.
The 2nd Millennium began in the year 1001.
The start of the second millennium AD was 1001, and the final year of the second millennium was 2000.
From the year 1001 to 2000.
Second
From the 1st of January 1001 to the 31st of December 2000.
A millennium is 1000 years. Therefore, the first millennium (after Christ) is years 1-1000, the second millennium is 1001-2000, and the third millennium (which started a few years ago) is 2001-3000.
A millennium year is the last year of a calendar millennium, so the next one is 3000.
The year 1399 was in the second millennium.
2000 BC through 1001 BC
It will be the third millennium, being its final year.
The year zero was the year before the first millennium.
A millennium