OffsetMonth 和 OffsetDay

 

 

 /*nMonth可以为负bKeepMonthIfDayOfMonthOverflow==true 时，当调整月份后该月没有这一天，则保持在这个月最后一天（如：odtTime为201-03-31，nMonth==-1时，调整后日期为2011-02-28）bKeepMonthIfDayOfMonthOverflow==false 时，当调整月份后该月没有这一天，则产生进位（如：odtTime为201-03-31，nMonth==-1时，调整后日期为2011-03-3）*/bool OffsetMonth( IN OUT COleDateTime& odtTime,const int nMonth,bool bKeepMonthIfDayOfMonthOverflow=true){static int nY,nM,nD,nDeltaM,nDeltaY;nD=odtTime.GetDay();nM=odtTime.GetMonth();nY=odtTime.GetYear();nDeltaM=nMonth%12;nDeltaY=nMonth/12;nY+=nDeltaY;nM+=nDeltaM;if (nM<1)//月借位{nY-=1;nM+=12;}if (nM>12)//月进位{nY+=nM/12;nM%=12;}if (nD>28){COleDateTimeSpan spOneDay(1,0,0,0);COleDateTime temDate(nY,nM,28,0,0,0);int i=1;for ( i=1;i<=4;i++){temDate+=spOneDay;//CString strMsg=temDate.Format(_T("%Y-%m-%d"));if(temDate.GetMonth()!=nM){i--;break;}}int nLastDayOfMonth=28+i;if (nD>nLastDayOfMonth){if (bKeepMonthIfDayOfMonthOverflow){nD=nLastDayOfMonth;}else{nD-=nLastDayOfMonth;nM+=1;//天进位if (nM>12)//月进位{nY+=nM/12;nM%=12;}}}}odtTime.SetDateTime(nY,nM,nD,odtTime.GetHour(),odtTime.GetMinute(),odtTime.GetSecond());return true;}

 

bool OffsetDay( IN OUT COleDateTime& odtTime,const int nDays ){static COleDateTimeSpan spanOneDay(1,0,0,0);odtTime+=spanOneDay*nDays;return true;}