Python - Find number of years completed between two sting dates

To find the number of completed years between two dates using Python, we will also have to check months and days.
Refer sample below.

from datetime import datetime

date1 = datetime(2022, 4, 15)
date2 = datetime(2025, 5, 25)

yearsbetween = 0
if(date2.month > date1.month):
    yearsbetween = date2.year - date1.year
elif(date2.month < date1.month):
    yearsbetween = (date2.year - date1.year) - 1
else:
    if(date2.day >= date1.day):
        yearsbetween = date2.year - date1.year
    else:
        yearsbetween = (date2.year - date1.year) - 1

print(yearsbetween)

Output: 3

Try changing month and days of date2 to see different outputs.
If date2 month changed to 3, output becomes 2.
If date2 month changed to 4, and day >= 15, output becomes 3.
If date2 month changed to 4, and day < 15, output becomes 2.

String dates are to be converted to datetime object before finding the difference, as in sample below.
For more samples on string to date conversion refer Convert String to Datetime - All Formats

from datetime import datetime

stringdate1 = "04-15-22"
stringdate2 = "05-25-25"
date1 = datetime.strptime(stringdate1, '%m-%d-%y')
date2 = datetime.strptime(stringdate2, '%m-%d-%y')

yearsbetween = 0
if(date2.month > date1.month):
    yearsbetween = date2.year - date1.year
elif(date2.month < date1.month):
    yearsbetween = (date2.year - date1.year) - 1
else:
    if(date2.day >= date1.day):
        yearsbetween = date2.year - date1.year
    else:
        yearsbetween = (date2.year - date1.year) - 1

print(yearsbetween)

Output: 3