C++ 利用CTime类来获取系统时间

#include <iostream>
#include<atltime.h>

using namespace::std;

int main()
{
	CTime today = CTime::GetCurrentTime();
	cout << today.GetYear() << "-" << today.GetMonth() << "-" << today.GetDay() << endl;

	return 0;
}

上述代码可正常运行，无需调设置。
运行环境：VS2017的Windows控制台应用程序。
最后附上CTime类在头文件中的定义（非自定义）。

class CTime
{
public:
	static CTime WINAPI GetCurrentTime() throw();
	static BOOL WINAPI IsValidFILETIME(_In_ const FILETIME& ft) throw();

	CTime() throw();
	CTime(_In_ __time64_t time) throw();
	CTime(
		_In_ int nYear,
		_In_ int nMonth,
		_In_ int nDay,
		_In_ int nHour,
		_In_ int nMin,
		_In_ int nSec,
		_In_ int nDST = -1);
	CTime(
		_In_ WORD wDosDate,
		_In_ WORD wDosTime,
		_In_ int nDST = -1);
	CTime(
		_In_ const SYSTEMTIME& st,
		_In_ int nDST = -1);
	CTime(
		_In_ const FILETIME& ft,
		_In_ int n