Python 3.x 不能在过去的条件中设置时间

我需要做什么。

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我需要这个程序不允许用户输入过去的日期。当我按当前的方式尝试时，我收到以下错误消息。TypeError:“您实际上需要两个

datetime

对象来使用

from datetime import datetime
from datetime import date
def addNewItems():
        end = 4
        while end == 4:
            ToDoList = [ ]
            Name = input("Enter the name of your task")
            dateIn = input("Enter the task completion date. yyyy/mm/dd HH:MM:SS")
            date = datetime.strptime(dateIn, "%Y/%m/%d %H:%M:%S")
            now = datetime.now()
            now_ = now.strftime("%d/%m/%Y %H:%M:%S")
            if date < now_:
                print("Time entered is in the past! Select options again")
                continue
            if Name in ToDoList:
                print("Task already exists! Select options again")
                continue
            if date < now_ and Name not in ToDoList:
                ToDoList.append(Name, date)
                print("Task Added Sucessfully")
                break