VC++时间操作——CTime与CTimeSpan类的使用

CTime

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

	CTime() throw();
	CTime( __time64_t time ) throw();
	CTime( int nYear, int nMonth, int nDay, int nHour, int nMin, int nSec,
		int nDST = -1 );
	CTime( WORD wDosDate, WORD wDosTime, int nDST = -1 );
	CTime( const SYSTEMTIME& st, int nDST = -1 );
	CTime( const FILETIME& ft, int nDST = -1 );
#ifdef __oledb_h__
	CTime( const DBTIMESTAMP& dbts, int nDST = -1 ) throw();
#endif

	CTime& operator=( __time64_t time ) throw();

	CTime& operator+=( CTimeSpan span ) throw();
	CTime& operator-=( CTimeSpan span ) throw();

	CTimeSpan operator-( CTime time ) const throw();
	CTime operator-( CTimeSpan span ) const throw();
	CTime operator+( CTimeSpan span ) const throw();

	bool operator==( CTime time ) const throw();
	bool operator!=( CTime time ) const throw();
	bool operator<( CTime time ) const throw();
	bool operator>( CTime time ) const throw();
	bool operator<=( CTime time ) const throw();
	bool operator>=( CTime time ) const throw();

	struct tm* GetGmtTm( struct tm* ptm ) const;
	struct tm* GetLocalTm( struct tm* ptm ) const;
#if !_SECURE_ATL
	_ATL_INSECURE_DEPRECATE("Pass an output time structure to CTime::GetGmtTm")
	struct tm* GetGmtTm() const throw();
	_ATL_INSECURE_DEPRECATE("Pass an output time structure to CTime::GetLocalTm")
	struct tm* GetLocalTm() const throw();
#endif

	bool GetAsSystemTime( SYSTEMTIME& st ) const throw();
	bool GetAsDBTIMESTAMP( DBTIMESTAMP& dbts ) const throw();

	__time64_t GetTime() const throw();

	int GetYear() const throw();
	int GetMonth() const throw();
	int GetDay() const throw();
	int GetHour() const throw();
	int GetMinute() const throw();
	int GetSecond() const throw();
	int GetDayOfWeek() const throw();

#ifndef _ATL_MIN_CRT
	// formatting using "C" strftime
	CString Format( LPCTSTR pszFormat ) const;
	CString FormatGmt( LPCTSTR pszFormat ) const;
	CString Format( UINT nFormatID ) const;
	CString FormatGmt( UINT nFormatID ) const;
#endif

#if defined(_AFX) && defined(_UNICODE)
	// for compatibility with MFC 3.x
	CString Format(LPCSTR pFormat) const;
	CString FormatGmt(LPCSTR pFormat) const;
#endif

#ifdef _AFX
	CArchive& Serialize64(CArchive& ar);
#endif

private:
	__time64_t m_time;
};

CTime获取当前时间

CTime timeNow = CTime::GetCurrentTime();

CTime指定时间初始化 2022-08-15 10:22:03

CTime timeNow(2022,8,15,10,22,3);

CTime比较大小

CTime time1(2022,8,15,10,22,3);
CTime time2(2022,8,15,10,22,4);
if(time1 < time2){//true
	...
}

CTime转化CString

CTime timeNow = CTime::GetCurrentTime();
CString strTime = timeNow.Format(L"%Y-%m-%d %H:%M:%S 星期%w");

CString转CTime

CString strTime("2222-11-29 11:06:23");
int nYear, nMonth, nDate, nHour, nMin, nSec;
sscanf(strTime, "%d-%d-%d %d:%d:%d", &nYear, &nMonth, &nDate, &nHour, &nMin, &nSec);
CTime t(nYear, nMonth, nDate, nHour, nMin, nSec);

CTimeSpan

class CTimeSpan
{
public:
	CTimeSpan() throw();
	CTimeSpan( __time64_t time ) throw();
	CTimeSpan( LONG lDays, int nHours, int nMins, int nSecs ) throw();

	LONGLONG GetDays() const throw();
	LONGLONG GetTotalHours() const throw();
	LONG GetHours() const throw();
	LONGLONG GetTotalMinutes() const throw();
	LONG GetMinutes() const throw();
	LONGLONG GetTotalSeconds() const throw();
	LONG GetSeconds() const throw();

	__time64_t GetTimeSpan() const throw();

	CTimeSpan operator+( CTimeSpan span ) const throw();
	CTimeSpan operator-( CTimeSpan span ) const throw();
	CTimeSpan& operator+=( CTimeSpan span ) throw();
	CTimeSpan& operator-=( CTimeSpan span ) throw();
	bool operator==( CTimeSpan span ) const throw();
	bool operator!=( CTimeSpan span ) const throw();
	bool operator<( CTimeSpan span ) const throw();
	bool operator>( CTimeSpan span ) const throw();
	bool operator<=( CTimeSpan span ) const throw();
	bool operator>=( CTimeSpan span ) const throw();

#ifndef _ATL_MIN_CRT
public:
	CString Format( LPCTSTR pszFormat ) const;
	CString Format( UINT nID ) const;
#endif
#if defined(_AFX) && defined(_UNICODE)
	// for compatibility with MFC 3.x
	CString Format(LPCSTR pFormat) const;
#endif

#ifdef _AFX
	CArchive& Serialize64(CArchive& ar);
#endif

private:
	__time64_t m_timeSpan;
};

CTimeSpan 计算CTime时间差

CTime time1(2022,8,15,10,22,3);
CTime time2 = CTime::GetCurrentTime(); 
CTimeSpan timeSpan = time2-time1; //计算当前系统时间与时间time1的间隔
timeSpan.GetDays(); //获取这段时间间隔共有多少天
timeSpan.GetTotalHours(); //获取这段时间间隔共有多少小时
timeSpan.GetTotalMinutes();//获取这段时间间隔共有多少分钟
timeSpan.GetTotalSeconds();//获取这段时间间隔共有多少秒

CTime加上特定时间

CTime time1(2022,8,15,10,22,3);//2022-08-15 10:22:03
CTimeSpan timeSpan(0,0,1,0);//时间差1分钟
time1 += timeSpan;//2022-08-15 10:23:03