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:
| Office | Type | Location | Took Office | Left Office |
| --- | --- | --- | --- | --- |
| State Representative | Legislature | Dover | January 6, 1801 | January 5, 1802 |
| State Representative | Legislature | Dover | January 5, 1802 | January 4, 1803 |
| State Representative | Legislature | Dover | January 4, 1803 | January 3, 1804 |
| State Attorney General | Executive | Dover | 1806 | 1810 |
| U.S. Senator | Legislature | Washington | January 12, 1810 | March 3, 1815 |
| U.S. Senator | Legislature | Washington | March 4, 1815 | March 3, 1821 |
Question:
What left office date happened in Washington?
Answer:
March 3, 1815, March 3, 1821