C++中类出现预期的不合格id错误

我的代码中有一些错误，我不知道如何修复它们。我试着用谷歌搜索类似的错误，但我无法解决我一直遇到的问题。

这是我的代码：

#include <iostream>
using namespace std;
class Date
{
private:
int year;
int month;
int day;
public:
    void setDay(int);
    void setMonth(int);
    void setYear(int);
    int getDay() const;
    int getMonth() const;
    int getYear() const;
    int getDate() const;
};

void Date::setDay(int d)
{
day = d;
}
void Date::setMonth(int m)
{
month = m;
}

void Date::setYear(int y)
{
year = y;
}

int Date::getDay() const;
{   
return day;
}

int Date::getMonth() const;
{
return month;
}
int Date::getYear() const;
{
return year;
}

int main() {
Date dat;
int datDay; //local variable for day
int datMon; //local variable for month
int datYea; //local variable for year
cout << "What is the day?";
cin >> datDay;
cout << "What is the month?";
cin >> datMon;
cout << "What is the year?";
cin >> datYea;
dat.setDay(datDay);
dat.setMonth(datMon);
dat.setYear(datYea);
//display
cout << "Day: " << dat.getDay() << endl;
cout << "Month: " << dat.getMonth() << endl;
cout << "Year: " << dat.getYear() << endl;
return 0;
}

以下是我的错误：

gr_hw8.cpp:26:1: error: expected unqualified-id
void Date::setDay(int d)
^
gr_hw8.cpp:33:1: error: expected unqualified-id
void Date::setMonth(int m)
^
gr_hw8.cpp:40:1: error: expected unqualified-id
void Date::setYear(int y)
^
gr_hw8.cpp:47:1: error: expected unqualified-id
int Date::getDay() const;
^
gr_hw8.cpp:48:1: error: expected unqualified-id
{       
^
gr_hw8.cpp:54:1: error: expected unqualified-id
int Date::getMonth() const;
^
gr_hw8.cpp:55:1: error: expected unqualified-id
{
^
gr_hw8.cpp:60:1: error: expected unqualified-id
int Date::getYear() const;
^
gr_hw8.cpp:61:1: error: expected unqualified-id
{
^
gr_hw8.cpp:68:1: error: expected unqualified-id
int main() {
^
10 errors generated.

谢谢！！