Write function to calculate half-birthday

[fhightower]

HELP WANTED 👋 : If you'd like to take this challenge on, please let me know! Even if you're new to Python and/or github, this is a great place to start and I'd be happy to help walk you through this challenge as much as you need - don't hesitate to ask.

This particular issue will give you some exposure to writing a relatively simple function, working with dates in Python, and writing some tests.

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What?

I would like a function to calculate a half birthday. It should be implemented based on the more precise method described in Wikipedia:

The more precise method is to add or subtract half the number of days in a year to the birth date. In the case of a common year, this would be 182.5 days. In leap years, the number of days would be 183. This method would lead to a March 1 or February 29 half-birthday for an August 31st birthday, depending on whether it's a leap year.

A couple other thoughts:

• The function should be wrapped with the @date_parse_first_argument decorator so that it can take a datetime object or a string in a parsable date format
• The function should return a datetime.date or datetime.datetime object (I'll leave it up to you, but am happy to give some input if needed)

Why?

This is a fun function to have 😄

How?

I can give some implementation guidance if needed. Otherwise, you got this!