Some functional methods with months

utils.py

import calendar
from datetime import datetime
import pytz

def month_range(year, month):
    init = datetime(year, month, 1, 0, 0, 0, 0, tzinfo=pytz.UTC)
    max_day_month = calendar.monthrange(year, month)[1]
    final = datetime(year, month, max_day_month, datetime.max.hour, datetime.max.minute,
                     datetime.max.second, datetime.max.microsecond, tzinfo=pytz.UTC)
    return init, final


def get_previus_month(month, year):
    month -= 1
    if month <= 0:
        month += 12
        year -= 1
    return month, year