Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Event | Time | Nationality | Date | Meet | Location |
| --- | --- | --- | --- | --- | --- |
| 50 m freestyle | 20.51 | Brazil | 17 December 2010 | World Championships | Dubai , United Arab Emirates |
| 100 m freestyle | 45.08 | United States | 19 December 2009 | Duel in the Pool | Manchester , United Kingdom |
| 200 m freestyle | 1:40.80 | Canada | 15 November 2009 | World Cup | Berlin , Germany |
| 400 m freestyle | 3:34.81 | United States | 22 February 2009 | Japan Open | Tokyo , Japan |
| 800 m freestyle | 7:33.94 | United States | 19 December 2009 | Duel in the Pool | Manchester , United Kingdom |
| 1500 m freestyle | 14:28.63 | Canada | 8 August 2009 | British Grand Prix | Leeds , United Kingdom |
| 50 m backstroke | 22.61 | United States | 22 November 2009 | World Cup | Singapore , Singapore |
| 100 m backstroke | 48.94 | United States | 18 December 2009 | Duel in the Pool | Manchester , United Kingdom |
| 200 m backstroke | 1:46.68 | United States | 19 December 2010 | World Championships | Dubai , United Arab Emirates |
| 50 m breaststroke | 25.70 | Brazil | 14 November 2009 | World Cup | Berlin , Germany |
| 100 m breaststroke | 56.49 | Brazil | 15 November 2009 | World Cup | Berlin , Germany |
| 200 m breaststroke | 2:02.92 | United States | 17 January 2004 | World Cup | Berlin , Germany |
| 50 m butterfly | 22.16 | Brazil | 21 November 2009 | World Cup | Singapore , Singapore |
| 100m butterfly | 48.80 | United States | 21 October 2013 | World Cup | Doha , Qatar |
| 200 m butterfly | 1:49.11 | Brazil | 10 November 2009 | World Cup | Stockholm , Sweden |
| 100m individual medley | 50.71 | United States | 15 December 2012 | World Championships | Istanbul , Turkey |
| 200m individual medley | 1:49.63 | United States | 14 December 2012 | World Championships | Istanbul , Turkey |
| 400m individual medley | 3:55.50 | United States | 16 December 2010 | World Championships | Dubai , United Arab Emirates |
| 4×50m freestyle relay | 1:25.28 | CRF Rio de Janeiro | 20 August 2012 | José Finkel Trophy | São Paulo , Brazil |
| 4×100m freestyle relay | 3:03.30 | United States | 19 December 2009 | Duel in the Pool | Manchester , United Kingdom |
| 4×200m freestyle relay | 6:49.58 | United States | 16 December 2010 | World Championships | Dubai , United Arab Emirates |
| 4×50m medley relay | 1:34.58 | United States | 26 March 2004 | NCAA Division I Championships | East Meadow , United States |
| 4×100m medley relay | 3:20.71 | United States | 18 December 2009 | Duel in the Pool | Manchester , United Kingdom |
Question:
What is Date, when Meet is "World Championships", when Nationality is "United States", and when Time is "1:46.68"?
Answer:
19 December 2010