These are a few helper functions I ended up wanting while working with months while doing freelance work. I'm putting them up here since, though simple, they ended up being useful enough that if I ever work with dates again I'll probably end up using them

month_utils.py

import datetime
from dateutil.relativedelta import relativedelta

def relative_month(d, months):
    """Accepts a datetime or date object and returns another datetime object.
    The returned datetime is the start of the datetime n months away. This does
    not have side effects.

    Args:
      d - a date or datetime object
      months - an integer representing the number of months to adjust d

    Return:
      an adjusted datetime
    """
    return start_of_month(d + relativedelta(months=months))
    
    
def start_of_month(d):
    """Accepts a datetime or date object. Returns a datetime object of the same
    year and month. Does not have side effects.

    Args:
      d - a date or datetime object

    Returns:
      a datetime object representing the start of the month in d
    """
    return datetime.datetime(d.year, d.month, 1)