Pandas - Python - how to subtract two different date columns

Question

Trying to have a column be filled with today's date minus the created_date column, but getting the following error : TypeError: unsupported operand type(s) for -: 'str' and 'str'

import datetime
now = datetime.date.today()
today = '{0:%m/%d/%Y}'.format(now).format(now)
today
data['Aging'] = today
data['Aging'] = data['Aging'].sub(data['Created_Date'], axis=0)

TypeError: unsupported operand type(s) for -: 'str' and 'str'

Answer 1

I think need subtract datetimes, so is necessary convert date in now and in Created_Date column, last for convert timedeltas to days use dt.days:

import datetime
now = datetime.date.today()
today = pd.Timestamp(now)

data['Created_Date'] = pd.to_datetime(data['Created_Date'])
data['Aging'] = today
data['Aging'] = data['Aging'].sub(data['Created_Date'], axis=0).dt.days

Solution should be simplify:

data['Created_Date'] = pd.to_datetime(data['Created_Date'])
data['Aging'] = data['Created_Date'].rsub(today, axis=0).dt.days