Write pseudocode and source code please

Write a program that calculates the number of days from the beginning of the year till the given date. Your program should prompt the user to input the year in yyyy, month in mm, and day in dd format. Your program should be fool proof; which means it should check for valid values for year, month, and date. If the user enter invalid data for any of these, prompt to re-enter until the user enters the correct data (use loop). Once your program displays the result, it should ask whether the user wants to enter another date. If the answer is yes, it needs to prompt the user again for the date and calculate the number of days (use appropriate loop). You program should consider that leap year has 29 days in February. Your program should make use of switch (mm), where mm is the variable used to store the month of the given date. The case statements should fall through (no break statement) until the last case before default. If input validation is correct, the statements under default case will not be executed Your should display the number of days elapsed till the given date