Day-of-Week Date Method | Dataford Interview Questions

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Problem

A Veterans United Home Loans application workflow needs to identify the weekday associated with a future follow-up date. Given a calendar date and a number of days, return the weekday name for the date that many days later.

Formal Specification

Implement next_day_of_week(date, days), where date is a string in YYYY-MM-DD format and days is an integer from 0 through 500. Return one of the weekday strings Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday.

The input date is always valid and uses the Gregorian calendar. A value of 0 means return the weekday of the input date itself. Account for month lengths, leap years, and year boundaries.

Constraints

date is a valid Gregorian date in YYYY-MM-DD format.
0 <= days <= 500
The date and resulting date are representable by Python's datetime.date.
The output must be a full weekday name with an initial capital letter.

Function Signature

def next_day_of_week(date, days):