given a birthday date will display the day of the week.
It will receive a number then receive the birthday date and return the day of the week then display how many birthday dates fall on each day of the week.
need a formula to calculate the day of the week for December 31 of the previous year.
Day 0: Sunday
Day 1: Monday
Day 2: Tuesday
Day 3: Wednesday
Day 4: Thursday
Day 5: Friday
Day 6: Saturday
Use switch statement to make this calculation.