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 | Score | Loss | Attendance | Record |
| --- | --- | --- | --- | --- | --- |
| April 1 | @ Padres | 1–2 | Backe (0–1) | 20825.0 | 0–2 |
| April 2 | @ Padres | 9–6 | Hoffman (0–1) | 18714.0 | 1–2 |
| April 3 | @ Padres | 2–3 | Villareal (0–1) | 24432.0 | 1–3 |
| April 4 | @ Cubs | 4–3 | Lieber (0–1) | 37812.0 | 2–3 |
| April 5 | @ Cubs | 7–9 | Oswalt (0–2) | 40707.0 | 2–4 |
| April 6 | @ Cubs | 2–3 | Villarreal (0–2) | 40929.0 | 2–5 |
| April 7 | Cardinals | 5–3 | McClellan (0–1) | 43483.0 | 3–5 |
| April 8 | Cardinals | 3–5 | Geary (0–1) | 30184.0 | 3–6 |
| April 9 | Cardinals | 4–6 | Sampson (0–1) | 29187.0 | 3–7 |
| April 11 | Marlins | 6–10 | Oswalt (0–3) | 34191.0 | 3–8 |
| April 12 | Marlins | 5–0 | Miller (0–2) | 34336.0 | 4–8 |
| April 13 | Marlins | 5–1 | Badenhop (0–1) | 29766.0 | 5–8 |
| April 15 | @ Phillies | 3–4 | Valverde (2–1) | 34609.0 | 5–9 |
| April 16 | @ Phillies | 2–1 | Kendrick (1–2) | 31644.0 | 6–9 |
| April 17 | @ Phillies | 2–10 | Backe (1–2) | 33526.0 | 6–10 |
| April 18 | Rockies | 11–5 | Sampson (0–2) | 34272.0 | 6–11 |
| April 19 | Rockies | 2–3 | Villarreal (0–3) | 34540.0 | 6–12 |
| April 20 | Rockies | 6–4 | Fuentes (0–1) | 35286.0 | 7–12 |
| April 21 | Padres | 10–3 | Germano (0–2) | 28600.0 | 8–12 |
| April 22 | Padres | 11–7 | Bell (0–2) | 33434.0 | 9–12 |
| April 23 | @ Reds | 9–3 | Arroyo (0–3) | 16017.0 | 10–12 |
| April 24 | @ Reds | 5–3 | Cueto (3) | 17403.0 | 11–12 |
| April 25 | @ Cardinals | 3–2 | Isringhausen (1–2) | 41193.0 | 12–12 |
| April 26 | @ Cardinals | 3–4 | Borkowski (0–1) | 43040.0 | 12–13 |
| April 27 | @ Cardinals | 1–5 | Backe (1–3) | 44222.0 | 12–14 |
| April 28 | @ D-backs | 3–5 | Sampson (1–3) | 19868.0 | 12–15 |
| April 29 | @ D-backs | 6–4 | González (1–2) | 20241.0 | 13–15 |
| April 30 | @ D-backs | 7–8 | Borkowski (0–2) | 21519.0 | 13–16 |
Question:
Record of 12–15 happened on what date?
Answer:
April 28