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 6 | @ Tigers | 4 - 2 | Gullickson (0-1) | 51068.0 | 1-0 |
| April 8 | @ Tigers | 10 - 9 | Tanana (0-1) | 12819.0 | 2-0 |
| April 9 | @ Tigers | 3 - 1 | Terrell (0-1) | 9720.0 | 3-0 |
| April 10 | Orioles | 4 - 3 | Olson (0-1) | 50424.0 | 4-0 |
| April 11 | Orioles | 7 - 2 | Sutcliffe (1-1) | 50375.0 | 5-0 |
| April 12 | Orioles | 3 - 1 | Mesa (0-1) | 48309.0 | 6-0 |
| April 13 | Yankees | 5 - 2 | Stottlemyre (0-1) | 44115.0 | 6-1 |
| April 14 | Yankees | 12 - 6 | Johnson (0-1) | 45579.0 | 7-1 |
| April 15 | Yankees | 2 - 0 | Pérez (1-1) | 48111.0 | 8-1 |
| April 16 | Yankees | 7 - 6 | Farr (0-1) | 50376.0 | 9-1 |
| April 17 | @ Red Sox | 1 - 0 | Wells (1-1) | 27467.0 | 9-2 |
| April 18 | @ Red Sox | 2 - 1 | Viola (0-2) | 32640.0 | 10-2 |
| April 19 | @ Red Sox | 5 - 4 | Henke (1-1) | 28196.0 | 10-3 |
| April 20 | @ Red Sox | 6 - 4 {13) | Bolton (0-1) | 34709.0 | 11-3 |
| April 21 | Indians | 2 - 1 | Cook (0-2) | 40191.0 | 12-3 |
| April 22 | Indians | 7 - 2 | Stieb (0-1) | 43292.0 | 12-4 |
| April 23 | Indians | 13 - 8 | Otto (1-2) | 42401.0 | 13-4 |
| April 24 | Royals | 4 - 3 | Gordon (0-2) | 50352.0 | 14-4 |
| April 25 | Royals | 6 - 4 | Young (0-1) | 50346.0 | 15-4 |
| April 26 | Royals | 9 - 0 | Morris (3-1) | 46486.0 | 15-5 |
| April 28 | Angels | 9 - 5 | Stieb (0-2) | 46201.0 | 15-6 |
| April 29 | Angels | 1 - 0 | Abbott (1-3) | 47356.0 | 16-6 |
| April 30 | @ Brewers | 3 - 2 | Ward (1-1) | 8877.0 | 16-7 |
Question:
What day did the record reach 15-4?
Answer:
April 25