这段代码使用日期时间有什么问题？答案

【问题标题】：What's wrong with this code using datetime?这段代码使用日期时间有什么问题？
【发布时间】：2018-02-02 01:16:43
【问题描述】：

import datetime

CurrentDate = datetime.date.today().strftime('%m/%d/%Y') 
print(CurrentDate)

UserInput =  input("When is your birthday? (mm/dd/yyyy) ")
birthday = datetime.datetime.strptime(UserInput, '%m/%d/%Y').date()
days = birthday - CurrentDate
print("your next birthday is in " + days )

它给了我这个错误信息：

TypeError: 不支持的操作数类型 -: 'datetime.date' 和 'str'

我尝试转换它们但没有结果。

【问题讨论】：

您正试图从字符串中减去 datetime.date。有时有助于阅读错误消息;-)
可能复制到stackoverflow.com/questions/1345827/…
CurrentDate 是一个字符串，因为无论出于何种原因，您都在对其调用.strftime('%m/%d/%Y')。
How do I find the time difference between two datetime objects in python?的可能重复

标签： python datetime

【解决方案1】：

您的问题是从 date 类型转换为 str ，反之亦然：

import datetime

CurrentDate = datetime.date.today()
print(CurrentDate.strftime('%m/%d/%Y'))

UserInput =  input("When is your birthday? (mm/dd/yyyy) ")
birthday = datetime.datetime.strptime(UserInput, '%m/%d/%Y').date()
days = birthday - CurrentDate
print("your next birthday is in " + str(days))

【讨论】：

【解决方案2】：

正如伯尼所说，CurrentDate 是string

import datetime

CurrentDate = datetime.date.today().strftime('%m/%d/%Y') 
print(CurrentDate)

UserInput =  input("When is your birthday? (mm/dd/yyyy) ")
birthday = datetime.datetime.strptime(UserInput, '%m/%d/%Y').date()
current_date = datetime.datetime.strptime(CurrentDate, '%m/%d/%Y').date()
print(birthday)

days = (birthday - current_date
print("your next birthday is in " + str(days) )

你的算法可能还需要一些工作:)

02/01/2018
When is your birthday? (mm/dd/yyyy) 01/01/2018
2018-01-01
your next birthday is in -31 days, 0:00:00

将调整后的时差除以天看起来更清晰：

days = (birthday - current_date)/datetime.timedelta(days=1)
print("your next birthday is in " + str(days) + " days")

【讨论】：