如果你有两个日期对象，你可以将它们相减，计算一个 timedelta 对象.

If you have two date objects, you can just subtract them, which computes a timedelta object.

from datetime import date

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

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

参见这个答案的另一个例子.