Question: What is the time period that 23964 is the population of the administrative territorial entity whose area is 1670 square kilometers?
Choices:
1917-09-13
2010-04-01
2017-07-06
2018-03-20
1992-03-30
2004-07-01
2009-01-14
2008-08-06
2009-02-22
1400-01-01