start_end_day_of_the_month.py

from datetime import date, timedelta
import re


def get_first_day(dt, d_years=0, d_months=0):
    # d_years, d_months are "deltas" to apply to dt
    y, m = dt.year + d_years, dt.month + d_months
    a, m = divmod(m - 1, 12)
    return date(y + a, m + 1, 1)


def get_last_day(dt):
    return get_first_day(dt, 0, 1) + timedelta(-1)


def start_end_day_of_the_month(year, month):

    h = str(get_first_day(date(year, month, 1)))
    list = re.split('-', h)
    list_int = [int(x) for x in list]

    i = str(get_last_day(date(year, month, 1)))
    list2 = re.split('-', i)
    list_int2 = [int(x) for x in list2]

    return [list_int[2], list_int2[2]]