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:
| Episode | First Air Date | Rating (18–49) | Share (18–49) | Viewers (millions) | Rank (timeslot) |
| --- | --- | --- | --- | --- | --- |
| 1.0 | January 3, 2011 | 2.9 | 7.0 | 9.04 | N/A |
| 2.0 | January 10, 2011 | 2.8 | 7.0 | 8.46 | N/A |
| 3.0 | January 17, 2011 | 2.7 | 7.0 | 8.80 | N/A |
| 4.0 | January 24, 2011 | 2.9 | 8.0 | 9.28 | N/A |
| 5.0 | January 31, 2011 | 3.2 | 8.0 | 9.66 | N/A |
| 6.0 | February 7, 2011 | 3.2 | 8.0 | 9.81 | N/A |
| 7.0 | February 14, 2011 | 2.9 | 8.0 | 9.32 | N/A |
| 8.0 | February 21, 2011 | 3.4 | 9.0 | 10.41 | N/A |
| 9.0 | February 28, 2011 | 3.5 | 9.0 | 11.33 | N/A |
| 10.0 | March 7, 2011 | 3.1 | 9.0 | 10.02 | N/A |
| 11.0 | March 14, 2011 | 4.5 | 13.0 | 13.88 | N/A |
Question:
When 4 is the episode what is the air date?
Answer:
January 24, 2011