I . write bool isLeapYear( int year) : returns true or false depending on whether or not input is a leap year.
II. write a function called int secondsSince( int usersBYear, int usersBmonth, int usersBDay) .
This function should return the number of seconds since that bithdate (year, month, day)
III. In Main: use cout and cin to ask user for their bithdate and then display how many seconds since that person’s bithdate
IV. Determine how many seconds have occurred since 0/0/0 .