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:
| Name | Pennant | Builder | Laid Down | Launched | Commissioned |
| --- | --- | --- | --- | --- | --- |
| Sutlej | U95 | Denny , Dunbarton | 4 January 1940 | 1 October 1940 | 23 April 1941 |
| Jumna | U21 | Denny , Dunbarton | 28 February 1940 | 16 November 1940 | 13 May 1941 |
| Narbada | U40 | Thornycroft , Woolston | 30 August 1941 | 21 November 1942 | 29 April 1943 |
| Godavari | U52 | Thornycroft , Woolston | 30 October 1941 | 21 January 1943 | 28 June 1943 |
| Kistna | U46 | Yarrow , Scotstoun | 14 July 1942 | 22 April 1943 | 26 August 1943 |
| Cauvery | U10 | Yarrow , Scotstoun | 28 October 1942 | 15 June 1943 | 21 October 1943 |
Question:
What date was the U21 pennant laid down?
Answer:
28 February 1940