CTime类及其变量使用

1 获取当前时间

CTime time = CTime::GetCurrentTime();

其中GetYear( ),GetMonth( ), GetDay( ), GetHour( ), GetMinute( ), GetSecond( ), GetDayOfWeek( ) 返回整型（int）对应项目

例：

int NowMonth = time1.GetMonth();

2 两个时间之间的比较

BOOL operator ==( CTime time ) const;
BOOL operator !=( CTime time ) const;
BOOL operator <( CTime time ) const;
BOOL operator >( CTime time ) const;
BOOL operator <=( CTime time ) const;
BOOL operator >=( CTime time ) const; 
例：

CTime t1 = CTime::GetCurrentTime();
CTime t2 = t1 + CTimeSpan( 1, 0, 0, 0 ); // 1 Day later
ASSERT( t1 != t2 );
ASSERT( t1 < t2 );
ASSERT( t1 <= t2 ); 
3 时间差

CTime operator +( CTimeSpan timeSpan ) const;
CTime operator - ( CTimeSpan timeSpan ) const;
CTimeSpan operator - ( CTime time ) const; 
例：

CTime t1( 1999, 3, 19, 22, 15, 0 ); // 10:15PM March 19, 1999
CTime t2( 1999, 3, 20, 22, 15, 0 ); // 10:15PM March 20, 1999
CTimeSpan ts = t2 - t1; // Subtract 2 Ctimes
ASSERT( ts.GetTotalSeconds() == 86400L );
ASSERT( ( t1 + ts ) == t2 ); // Add a CTimeSpan to a CTime.
ASSERT( ( t2 - ts ) == t1 ); // Subtract a CTimeSpan from a CTime. 
4 时间格式化

将当前时间格式化 CString date = time.Format("%Y-%m-%d %H:%M:%S %W-%A");

结果为：2006-10-13 17:23:47 41-Friday