Please help me with this question. I was stuck with the leap year and increment, reduction algorithm

public class Date { protected int year, month, day;

// Constructor public Date(int newMonth, int newDay, int newYear) { month = newMonth; day = newDay; year = newYear; }

// Observers public int getYear() { return year; } public int getMonth(){ return month; } public int getDay(){ return day; } // return true if this year is a leap year, otherwise, return false // Hint: // The year is a leap year if: // The year can be evenly divided by 4; // If the year can be evenly divided by 100, it is NOT a leap year, unless; // The year is also evenly divisible by 400. Then it is a leap year. public boolean isLeapYear(){ /* 1. Filling your code here */

/* 1. End of code */ } // calculate the number of days from this date to AD (1/1/0), and return the number of days. // e.g. result of getDaysToAD(1,2,0) is 1. public int getDaysToAD(){ /* 2. Filling your code here */ /* 2. End of code */ } // check if this date is between two other given dates (exclusive). // E.g. either 2/5/2020 of 2/15/2020 is not between 2/5/2020 and 2/15/2020 // Hint: it might save your effort if you use the getDaysToAD function public boolean isBetween(int month1, int day1, int year1, int month2, int day2, int year2){ /* 3. Filling your code here */ /* 3. End of code */ } // calculate the number of days from this date to an specifed date, and return the number of days. // E.g. 2/5/2020 to 2/15/2020 is 10; 2/15/2020 to 2/8/2020 is 7; // Hint: you might get help from getDaysToAD function public int getDaysToDate(int newMonth, int newDay, int newYear){ /* 4. Filling your code here */ /* 4. End of code */ } // Returns this date as a String in formate of month/day/year. E.g. 02/05/2020 public String toString(){ return(month + "/" + day + "/" + year); } }

public class IncDate extends Date {

public IncDate(int newMonth, int newDay, int newYear) { super(newMonth, newDay, newYear); } // Increments this IncDate to represent the next day. public void increment(){ /* 5. Filling your code here */

/* 5. End of code */ } // reduce this IncDate to represent the previous day. public void reduction(){ /* 6. Filling your code here */

/* 6. End of code */ } }