C++ 一个时间转换类封装

class UpTimeUtility
{
public:
    UpTimeUtility();
    virtual~ UpTimeUtility();

    
    static time_t GetCalendarTime();
    static __int64 GetCalendarTimeMilliseconds();
    //当天零点时间。
    static time_t GetCalendarTime_Zero(__int64 iTime = 0);
    static __int64 GetCalendarTimeMilliseconds_Zero(__int64 iTime = 0);
    //
    
    static time_t SystemTimeToCalendarTime(SYSTEMTIME &utc);
    static SYSTEMTIME CalendarTimeToSystemTime(time_t t);
    static SYSTEMTIME CalendarTimeMillisecondsToSystemTime(__int64 t);

    
    static time_t LocalTimeToCalendarTime(SYSTEMTIME <);
    static SYSTEMTIME CalendarTimeToLocalTime(time_t t); 

    static SYSTEMTIME SystemTimeToLocalTime(SYSTEMTIME &st);
    static