Python test datetime object if it is in the past present or future-CodePudding

in python, if I have a date string in the following format yyyy-mm-dd, I would like to write a function to check if the date is in the past, present or future. However, I am having some trouble with this. I have written the following code...

from datetime import datetime

def check_date(date_string):
    this_date = datetime.strptime(date_string, '%Y-%m-%d')
    now = datetime.today()
    if this_date < now:
        print("the date is in the past")
    elif this_date > now:
        print("the day is in the future")
    else:
        print("the day is today")

however, when I tested this, it gives me...

>>check_date('2022-08-08')
the date is in the past
>>check_date('2022-10-10')
the day is in the future
>>check_date('2022-09-22') #this is todays date
the date is in the past

I'm not sure why it is giving this unexpected behaviour. thanks

CodePudding user response：

datetime.datetime.today() includes both date and time, as a quick debug print would have shown. Use this:

import datetime

def check_date(date_string):
    this_date = datetime.datetime.strptime(date_string, '%Y-%m-%d')
    now = datetime.date.today()
...

CodePudding user response：

Try this!

from datetime import datetime

def check_date(date_string):
    this_date = datetime.strptime(date_string, '%Y-%m-%d').date()
    now = datetime.today().date()
    print(now, this_date)
    if this_date < now:
        print("the date is in the past")
    elif this_date > now:
        print("the day is in the future")
    else:
        print("the day is today")

CodePudding user response：

I believe the problem is where you get the today's date. datetime.today() create an instance which includes hours, minutes, seconds in addition to year, month, day. However, you are trying to compare them with date only (i.e., year, month, day format.

If you consider date.today() instead of datetime.today(), you should be good to go.

CodePudding user response：

from datetime import datetime
year = 2022
month = 9
day = 22
Date_to_check = datetime.date(datetime(year,month,day))
current_day = datetime.date(datetime.now())

if Date_to_check == current_day:
    print("it is present")
elif Date_to_check > current_day:
    print("it is future")
else:
    print("it is past")

please review this code and you'll get some idea how it is working.