VC获取Unix时间戳

// 获取Unix时间戳
std::wstring GetUnixTimeStamp(void)
{
	FILETIME ft = { 0 };
	SYSTEMTIME st = { 0 };
	ULARGE_INTEGER ull = { 0 };
	::GetSystemTime(&st);
	::SystemTimeToFileTime(&st, &ft);
	ull.LowPart = ft.dwLowDateTime;
	ull.HighPart = ft.dwHighDateTime;
	__int64 ts = (ull.QuadPart - 116444736000000000ULL) / 10000000ULL;
	std::wstring _str;
	_str.resize(100, L'\0');
	_i64tow(ts, const_cast<PWCHAR>(_str.c_str()), 10);
	return _str;
}