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 | Opponent | Site | Score | Loss |
| --- | --- | --- | --- | --- |
| Tuesday, April 6 | @ San Diego Padres | Jack Murphy Stadium | W, 1-0 | Eichelberger (0-1) |
| Wednesday, April 7 | @ San Diego Padres | Jack Murphy Stadium | W, 6-4 | Montefusco (0-1) |
| Friday, April 9 | Houston Astros | Atlanta-Fulton County Stadium | W, 6-2 | Sutton (0-1) |
| Saturday, April 10 | Houston Astros | Atlanta-Fulton County Stadium | W, 8-6 | Ruhle (0-1) |
| Sunday, April 11 | Houston Astros | Atlanta-Fulton County Stadium | W, 5-0 | Ryan (0-2) |
| Monday, April 12 | @ Cincinnati Reds | Riverfront Stadium | W, 6-1 | Berenyi (1-1) |
| Tuesday, April 13 | @ Cincinnati Reds | Riverfront Stadium | W, 8-5 | Kern (0-1) |
| Wednesday, April 14 | @ Cincinnati Reds | Riverfront Stadium | W, 5-2 (10 innings) | Kern (0-2) |
| Friday, April 16 | @ Houston Astros | Astrodome | W, 5-3 | Ryan (0-3) |
| Saturday, April 17 | @ Houston Astros | Astrodome | W, 2-1 | J. Niekro (1-1) |
| Sunday, April 18 | @ Houston Astros | Astrodome | W, 6-5 | D. Smith (0-1) |
| Tuesday, April 20 | Cincinnati Reds | Atlanta-Fulton County Stadium | W, 4-2 | Pastore (1-1) |
| Wednesday, April 21 | Cincinnati Reds | Atlanta-Fulton County Stadium | W, 4-3 | Shirley (0-1) |
| Thursday, April 22 | Cincinnati Reds | Atlanta-Fulton County Stadium | L, 1-2 | Walk (2-1) |
| Friday, April 23 | San Diego Padres | Atlanta-Fulton County Stadium | L, 3-6 (12 innings) | Camp (2-1) |
| Saturday, April 24 | @ San Diego Padres | Atlanta-Fulton County Stadium | L, 4-6 | Garber (1-1) |
| Monday, April 26 | Pittsburgh Pirates | Atlanta-Fulton County Stadium | L, 4-6 | McWilliams (2-1) |
| Tuesday, April 27 | Pittsburgh Pirates | Atlanta-Fulton County Stadium | L, 4-10 | Walk (2-2) |
| Wednesday, April 28 | Pittsburgh Pirates | Atlanta-Fulton County Stadium | W, 7-6 (10 innings) | Scurry (1-1) |
| Thursday, April 29 | Chicago Cubs | Atlanta-Fulton County Stadium | W, 3-0 | Jenkins (2-2) |
| Friday, April 30 | Chicago Cubs | Atlanta-Fulton County Stadium | W, 1-0 | Bird (1-4) |
Question:
When was the date that had a Loss of Shirley (0-1)?
Answer:
Wednesday, April 21