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 |
| --- | --- | --- | --- | --- | --- |
| May 1 | Rangers | 3 - 2 (10) | Williams (2-2) | 22,154 | 13-8 |
| May 2 | Rangers | 9 - 8 | Harris (1-3) | 28,352 | 14-8 |
| May 3 | Rangers | 3 - 1 | Correa (1-2) | 32,325 | 15-8 |
| May 4 | @ Royals | Postponed (rain) Rescheduled for July 3 | Postponed (rain) Rescheduled for July 3 | Postponed (rain) Rescheduled for July 3 | Postponed (rain) Rescheduled for July 3 |
| May 5 | @ Royals | 6 - 4 | Johnson (1-3) | 19,245 | 15-9 |
| May 6 | @ Royals | 6 - 3 | Key (4-2) | 28,083 | 15-10 |
| May 8 | @ Rangers | 7 - 4 | Guzmán (1-2) | 21,832 | 16-10 |
| May 9 | @ Rangers | 15 - 4 | Correa (1-3) | 28,847 | 17-10 |
| May 10 | @ Rangers | 9 - 8 | Eichhorn (4-2) | 17,356 | 17-11 |
| May 11 | Royals | 4 - 0 | Leibrandt (4-2) | 24,154 | 18-11 |
| May 12 | Royals | 3 - 1 | Cerutti (1-1) | 30,034 | 18-12 |
| May 13 | @ Twins | 7 - 0 | Portugal (1-2) | 9,158 | 19-12 |
| May 14 | @ Twins | 16 - 4 | Straker (2-1) | 10,053 | 20-12 |
| May 15 | @ Athletics | 3 - 2 | Plunk (1-2) | 13,139 | 21-12 |
| May 16 | @ Athletics | 10 - 3 | Key (5-3) | 20,900 | 21-13 |
| May 17 | @ Athletics | 3 - 0 | Cerutti (1-2) | 30,511 | 21-14 |
| May 18 | @ Angels | 12 - 0 | Cook (1-2) | 23,710 | 22-14 |
| May 19 | @ Angels | 2 - 1 | Musselman (2-1) | 23,622 | 22-15 |
| May 20 | @ Angels | 5 - 4 (10) | Henke (0-1) | 23,766 | 22-16 |
| May 22 | @ Mariners | 7 - 5 | Bankhead (5-3) | 10,012 | 23-16 |
| May 23 | @ Mariners | 6 - 2 | Moore (2-5) | 13,489 | 21-12 |
| May 24 | @ Mariners | 5 - 2 | Stieb (2-3) | 12,751 | 24-17 |
| May 25 | @ Mariners | 6 - 5 | Morgan (4-5) | 8,499 | 25-17 |
| May 27 | Athletics | 4 - 1 | Johnson (2-4) | 25,245 | 25-18 |
| May 28 | Athletics | 4 - 3 | Clancy (7-3) | 27,017 | 25-19 |
| May 29 | Angels | 3 - 1 | Sutton (2-5) | 33,107 | 26-19 |
| May 30 | Angels | 4 - 3 (10) | Lazorko (0-2) | 36,055 | 27-19 |
| May 31 | Angels | 7 - 2 | Candelaria (4-2) | 40,313 | 28-19 |
Question:
What was the date of the game with the Kansas City Royals when the Blue Jays record was 18-12?
Answer:
May 12