如果你有两个日期对象，你可以

If you have two date objects, you can just subtract them.

from datetime import date

d0 = date(2008, 8, 18)
d1 = date(2008, 9, 26)
delta = d0 - d1
print delta.days

文档的相关部分：
https： //docs.python.org/library/datetime.html