[Python] add date, week, month

import datetime
from dateutil.relativedelta import relativedelta


def string_to_date(dt, format='%Y%m%d'):
    return datetime.datetime.strptime(dt, format)

def date_to_string(date, format='%Y%m%d'):
    return datetime.datetime.strftime(date, format)

def add_date(dt, d):
    date = string_to_date(dt) + datetime.timedelta(days=d)
    return date_to_string(date)

def add_week(dt, d):
    date = string_to_date(dt) + datetime.timedelta(weeks=d)
    return date_to_string(date)

def add_month(dt, d):
    date = string_to_date(dt) + relativedelta(months=d)
    return date_to_string(date)

https://jaeyung1001.tistory.com/108

[Python] relativedelta함수 (timedelta엔 한달빼는게 왜없을까)