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 | Record |
| --- | --- | --- | --- | --- |
| April 5 | @ Royals | 11–2 | Underwood (0–1) | 0–1 |
| April 7 | @ Royals | 7–4 | Clancy (0–1) | 0–2 |
| April 8 | @ Royals | 8–3 | Lemongello (0–1) | 0–3 |
| April 10 | @ White Sox | 10–2 | Kravec (0–2) | 1–3 |
| April 11 | @ White Sox | Postponed (rain) Rescheduled for April 12 | Postponed (rain) Rescheduled for April 12 | Postponed (rain) Rescheduled for April 12 |
| April 12 | @ White Sox | 9–7 | LaGrow (0–1) | 2–3 |
| April 13 | Royals | 4–1 (6) | Splittorff (1–1) | 3–3 |
| April 14 | Royals | 8–6 | Leonard (1–1) | 4–3 |
| April 15 | Royals | 12–10 | Murphy (1–1) | 4–4 |
| April 16 | White Sox | 8–4 | Murphy (1–2) | 4–5 |
| April 17 | White Sox | 6–1 | Underwood (0–2) | 4–6 |
| April 18 | White Sox | 12–5 | Clancy (1–2) | 4–7 |
| April 20 | @ Tigers | 7–2 | Lemongello (0–2) | 4–8 |
| April 21 | @ Tigers | 5–4 | Billingham (1–1) | 5–8 |
| April 22 | @ Tigers | 4–1 | Underwood (0–3) | 5–9 |
| April 23 | @ Rangers | 5–0 | Clancy (1–3) | 5–10 |
| April 24 | @ Rangers | 2–0 | Comer (1–2) | 6–10 |
| April 25 | @ Rangers | 4–3 (10) | Jefferson (0–1) | 6–11 |
| April 27 | Brewers | 8–5 | Huffman (2–1) | 6–12 |
| April 28 | Brewers | 11–8 (10) | Willis (0–1) | 6–13 |
| April 29 | Brewers | 3–0 | Clancy (1–4) | 6–14 |
| April 29 | Brewers | 5–3 | Travers (0–2) | 7–14 |
| April 30 | Twins | 6–3 | Lemongello (0–3) | 7–15 |
Question:
What was the date of the game that had a loss of Willis (0–1)?
Answer:
April 28