def Next(self):
        if self.day < 28:
            print(self.day + 1,"/",self.month,"/",self.year)
        elif self.day == 28:
            if self.month == 2:
                if (self.year / 4).is_integer() == True:
                    if (self.year / 100).is_integer() == True:
                        if (self.year / 400).is_integer() == True:
                            print(self.day + 1,"/",self.month,"/",self.year)
                        else:
                            print(1,"/",self.month+1,"/",self.year)
                    else:
                        print(self.day + 1,"/",self.month,"/",self.year)
                else:
                    print(1,"/",self.month+1,"/",self.year)
        elif self.day == 29:
            if self.month == 2:
                print(1,"/",self.month+1,"/",self.year)
            else:
                print(self.day + 1,"/",self.month,"/",self.year)
        elif self.day == 30:
            if self.month == 4 or self.month == 6 or self.month == 9 or self.month == 11:
                print(1,"/",self.month+1,"/",self.year)
            else:
                print(self.day + 1,"/",self.month,"/",self.year)
        else:
            if self.day == 31:
                print(1,"/",self.month+1,"/",self.year)
    def Prev(self):
        if self.day == 1:
            if self.month == 3:
                if (self.year / 4).is_integer() == True:
                    if (self.year / 100).is_integer() == True:
                        if (self.year / 400).is_integer() == True:
                            print(29,"/",self.month - 1,"/",self.year)
                        else:
                            print(28,"/",self.month - 1,"/",self.year)
                    else:
                        print(29,"/",self.month - 1,"/",self.year)
                else:
                    print(28,"/",self.month - 1,"/",self.year)
            elif self.month == 5 or self.month == 7 or self.month == 10 or self.month == 12:
                print(30,"/",self.month - 1,"/",self.year)
            elif self.month == 1:
                print(31, "/", self.month + 11,"/",self.year - 1)
            else:
                print(31,"/", self.month - 1,"/", self.year)
        else:
            print(self.day - 1,"/",self.month,self.year)
    def isBefore(self,d):
        if d.year == self.year:
            if d.month == self.month:
                if d.day == self.day or d.day > self.day:
                    print(False)
                elif d.day < self.day:
                    print(True)
            elif d.month > self.month:
                print(False)
            else:
                print(True)
        elif d.year > self.year:
            print(False)
        else:
            print(True)
    def isAfter(self,d):
        if d.year == self.year:
            if d.month == self.month:
                if d.day == self.day or d.day > self.day:
                    print(True)
                elif d.day < self.day:
                    print(False)
            elif d.month > self.month:
                print(True)
            else:
                print(False)
        elif d.year > self.year:
            print(True)
        else:
            print(False)
    def isEqual(self,d):
        if d.year == self.year and d.month == self.month and d.day == self.day:
            print(True)
        else:
            print(False)