code: def datetime_format(desired_format, datetime_instance=None,  *args, **kwargs):
      
      for strf, exp in datetime_regex.datetime.format.items():
          desired_format = exp.sub(strf, desired_format)
      if not datetime_instance:
          datetime_instance = now()
      return datetime_instance.strftime(desired_format.format(*args, **kwargs))
docs: Replaces format style phrases (listed in the dt_exps dictionary)
      with this datetime instance's information.
  
      .. code :: python
  
          reusables.datetime_format("Hey, it's {month-full} already!")
          "Hey, it's March already!"
  
      :param desired_format: string to add datetime details too
      :param datetime_instance: datetime.datetime instance, defaults to 'now'
      :param args: additional args to pass to str.format
      :param kwargs: additional kwargs to pass to str format
      :return: formatted string