Create a calendar program that allows the user to enter a day, month, and year in three separate variables as shown below.

Please enter a date
Day:
Month:
Year:
Then, ask the user to select from a menu of choices using this formatting:

Menu:
1) Calculate the number of days in the given month.
2) Calculate the number of days left in the given year.
The program must include the following functions:

leap_year: Takes the year as a parameter and returns 1 if a year is a leap year (Links to an external site.) and 0 if it is not. This information will only be used by other functions.
number_of_days: This subprogram will accept two parameters in the following order: month and year. It will return how many days are in the given month (Links to an external site.).
days_left: This will accept three parameters in the following order: day, month, and year. It should calculate the number of days left in the year, and return the value of a number of days left. This should not include the date the user entered in the count.