We really just need to check that the row exists here, the date doesn't
matter. Checking the date here is actually flaky with regards to time.
When running locally at 11:50 EST, it failed with:
```
assert self._model.data(self._model.index(row, col)) == item
AssertionError: assert '1969-12-31' == '1970-01-01'
- 1969-12-31
+ 1970-01-01
```
It was wrong to assume that an atime of 0 would always format to
1970-01-01.
a9926e44f0