计算两个给定日期之间的天数差异。


start_date = "2022-01-01"
end_date = "2022-01-10"
这是一道编程问题，需要用编程语言解决。以下是Python的实现例子:

```python
from datetime import datetime

start_date = "2022-01-01"
end_date = "2022-01-10"

date_format = "%Y-%m-%d"

start = datetime.strptime(start_date, date_format)
end = datetime.strptime(end_date, date_format)

diff = (end - start).days

print(diff)
```

输出结果为9，表示两个日期之间相差9天。