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:
| Date | Name | Nationality | Tonnage (GRT) | Fate |
| --- | --- | --- | --- | --- |
| 19 February 1942 | British Consul | United Kingdom | 6940.0 | Damaged |
| 19 February 1942 | Mokihana | USA | 7460.0 | Damaged |
| 21 February 1942 | Circe Shell | United Kingdom | 8207.0 | Sunk |
| 23 February 1942 | Lihue | USA | 7001.0 | Sunk |
| 7 March 1942 | Uniwaleco | South Africa | 9755.0 | Sunk |
| 10 March 1942 | Lady Nelson | Canada | 7970.0 | Damaged |
| 10 March 1942 | Umtata | United Kingdom | 8141.0 | Damaged |
| 14 March 1942 | Sarniadoc | Canada | 1940.0 | Sunk |
| 15 March 1942 | USCGCAcacia | USA | 1130.0 | Sunk |
| 16 June 1942 | Nueva Altagracia | Dominican Republic | 30.0 | Sunk |
| 22 June 1942 | E.J. Sadler | USA | 9639.0 | Sunk |
| 3 July 1942 | San Pablo | Panama | 3305.0 | Total loss |
| 16 July 1942 | Fairport | USA | 6165.0 | Sunk |
| 23 October 1942 | HMSPhoebe | United Kingdom | 5450.0 | Damaged |
| 8 November 1942 | Bonalder | United Kingdom | 5161.0 | Damaged |
| 8 November 1942 | West Humhaw | USA | 5527.0 | Sunk |
| 29 November 1942 | Tjilboet | Netherlands | 5760.0 | Sunk |
| 12 December 1942 | Ripley | United Kingdom | 4997.0 | Sunk |
| 19 May 1943 | Angelus | Canada | 255.0 | Sunk |
| 20 September 1943 | St. Usk | United Kingdom | 5472.0 | Sunk |
| 26 September 1943 | Itapagé | Brazil | 4998.0 | Sunk |
Question:
What is the date of attack of the Circe Shell Ship?
Answer:
21 February 1942