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:
| Game | Date | Opponent | Score | Location | Record |
| --- | --- | --- | --- | --- | --- |
| 73.0 | Tue. Apr. 2 | @ New Jersey Nets | 94-77 | Brendan Byrne Arena | 53-20 |
| 74.0 | Thu. Apr. 4 | New Jersey Nets | 123-104 | Boston Garden | 54-20 |
| 75.0 | Sat. Apr. 6 | @ Orlando Magic | 98-102 | Orlando Arena | 54-21 |
| 76.0 | Thu. Apr. 11 | @ Milwaukee Bucks | 92-111 | Bradley Center | 54-22 |
| 77.0 | Fri. Apr. 12 | Miami Heat | 119-109 | Boston Garden | 55-22 |
| 78.0 | Sun. Apr. 14 | New York Knicks | 115-102 | Boston Garden | 56-22 |
| 79.0 | Tue. Apr. 16 | @ Detroit Pistons | 90-118 | The Palace of Auburn Hills | 56-23 |
| 80.0 | Thu. Apr. 18 | @ Philadelphia 76ers | 97-122 | The Spectrum | 56-24 |
| 81.0 | Fri. Apr. 19 | @ Cleveland Cavaliers | 117-124 (OT) | Richfield Coliseum | 56-25 |
| 82.0 | Sun. Apr. 21 | Atlanta Hawks | 105-117 | Boston Garden | 56-26 |
Question:
When was the score 56-26?
Answer:
Sun. Apr. 21