rollback.py

import datetime
import datefinder
from dateutil.relativedelta import relativedelta


def date_rollback(large_string, date_formatter):
    dates = list(datefinder.find_dates(large_string))
    result = large_string
    for date in dates:
        to_find = date.strftime("%m/%d/%Y")
        rollback = date - relativedelta(years=100)
        datemod = rollback.strftime(date_formatter)
        result = result.replace(str(to_find), str(datemod))
    return result

result = date_rollback("I moved to the U.S. on 06/21/1993 but moved to Nevada on 07/12/2008.", "%d/%m/%Y")
print(result)

the_task.txt

Write a function that takes two arguments, one large string and one smaller string.
The larger string will contain (amongst other text) dates of the format MM/DD/YYYY.
The smaller string will contain a date format, like "%b %d, %Y" or "%d/%m/%Y" or any valid date format string.
Your job will be to return the large text string with the dates rolled back by one century and formatted with whatever format was in the smaller string.

The dates you should consider will be any year between 1100 and 9999 AD.

Submit this thru canvas on the class website, you should be able to find the assignment...I will post a link