CODEWITHSUNDEEP
pythondatetime
Roman
Roman

Reputation: 3941

Python calculating datetime - Is date today between a certain datetime?

I have users who get a special offer for 6 months on registration. I save the datetime of the registration and know that this datetime + 6 months is the special offer.

Now I need after 5 month to display a button which reminds them that the offer is running out in 1 month.

So I need to check whether datetime.now() is within range:

user1 = datetime(2017,4,30)
user2 = datetime(2017,5,25)
user3 = datetime(2017,1,11) 
user4 = datetime(2017,2,20)
user5 = datetime(2017,12,23)
user6 = datetime(2017,7,22) 

list_of_users = [user1,user2,user3,user4,user5,user6]

for user_date in list_of_users:
    if datetime.now() < user_date + relativedelta(months=6) and datetime.now() > user_date + relativedelta(months=5):
        print user_date, "yes"

I have created some examples and user5 should be within this range, but somehow it wont recognize it.

Upvotes: 0

Views: 51

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1121924

Your code works just fine, albeit a bit verbose. user5 does not qualify your criteria, the data is 5+ months in the future, not in the past. Their special offer period has not yet started, let alone be 1 month away from expiring. They should only see the warning between the 23rd of May and June of 2018.

You can more concisely test by storing the cut-off dates first, and using chained comparisons:

now = datetime.now()
started_min, started_max = now - relativedelta(months=6), now - relativedelta(months=5)
for user_date in list_of_users:
    if started_min <= user_date <= started_max:
         print user_date, "yes"

So if a user started their offer between 5 and 6 months ago, they need to be reminded now, because they are in their last month.

Upvotes: 2

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