Calculating future date from input obtained date

[JorritTjeertes]

Hi all,

I am a newby in Python and after a bit of bragging to my wife, she challenged me to generate a due date calculator to confirm the due date of our first-born.

So, via
int(input("Date of conception: (enter in YYYYMMDD) "))
I obtain a date like 20201114.

But now I want to calculate the anticipated due date by taking that date and adding 280 days.

I am getting stuck in this, and would appreciate any help!

Thanks!!

Jorrit

[JorritTjeertes]

Hi all,

after several hours trying and failing I managed in the end. I am sure the code isn't too elegant, but it gave the result!

Happy to hear any suggestions or thoughts!

Jorrit

print("Due date calculator")
 
pregnancy_type = int(input("""
What type of pregnancy did you have?
1: Natural
2: 3-day IVF transfer
3: 5-day IVF transfer
 
Please choose 1, 2 or 3: """))
 
print("Please enter the starting date of conception")
conception_day = int(input("Day (DD): "))
conception_month = int(input("Month (MM): "))
conception_year = int(input("Year (YYYY): "))
 
#Calculating the date based on the inputs!!
import datetime
start_date = datetime.datetime(conception_year, conception_month, conception_day)
 
# Last period:  280 days
# 3 day IVF:  263 days
# 5 day IVF:  261 days
 
if pregnancy_type == 1:
    pregnancy_length_1 = 280
    future_date_1 = start_date + datetime.timedelta(days=pregnancy_length_1)
    print(f"""
Your due date is approximately: {future_date_1}
 
Congratulations on your pregnancy!""")
elif pregnancy_type == 2:
    pregnancy_length_2 = 263
    future_date_2 = start_date + datetime.timedelta(days=pregnancy_length_2)
    print(f"""
Your due date is approximately: {future_date_2}
 
Congratulations on your pregnancy!""")
elif pregnancy_type == 3:
    pregnancy_length_3 = 261
    future_date_3 = start_date + datetime.timedelta(days=pregnancy_length_3)
    print(f"""
Your due date is approximately: {future_date_3}
 
Congratulations on your pregnancy!""")
else:
    print("Please only choose 1, 2 or 3")
 

[Niheel]

Congratulations to the soon to be parents!

Just ran the program. It works.

The only other thing you can do is add validation of the input and display errors. Maybe use a function to check input?

Possibly by using something like this:

def check_user_input(input):
    try:
        # Convert it into integer
        val = int(input)
        print("Day is ", val)
    except ValueError:
        ask_day()
 
def ask_day():
    conception_day = input("Day (DD):")
    check_user_input(conception_day)
 
conception_day = ask_day()
 

[JorritTjeertes]

Hi Niheel,

Thanks for the feedback and suggestion!

I also exchanged the code:
{future_date_3}

with:
{future_date_3.strftime('%Y-%m-%d')}

to only show the date and not the time.

Thanks again!

Jorrit