C#中计算两个日期间隔的天数

 


//strIssueDate是一个参数，代表起始日期




//strMaturityDate是一个参数，代表结束日期




if(strIssueDate!="" && strMaturityDate!="")




   ...{   




    string []strStartDate=new string[]...{""};




    string []strEndDate=new string[]...{""};


    //将日期分割成数组


    int placeIssueDate=strIssueDate.IndexOf("-",0,strIssueDate.Length);           //判断日期中是否有'-'号


    int placeMaturityDate=strMaturityDate.IndexOf("-",0,strMaturityDate.Length);  //判断日期中是否有'-'号


    if(placeIssueDate==0)




    ...{




     strStartDate=new string[]...{strIssueDate.Substring(0,4),strIssueDate.Substring(4,2),strIssueDate.Substring(6,2)};


           


    }


    else




    ...{


     strStartDate=strIssueDate.Split('-'); 


    }


    if(placeMaturityDate==0)




    ...{




     strEndDate=new string[]...{strMaturityDate.Substring(0,4),strMaturityDate.Substring(4,2),strMaturityDate.Substring(6,2)};


    }


    else




    ...{


     strEndDate=strMaturityDate.Split('-'); 


    }


                


    TimeSpan tsIssueDays=new TimeSpan();   //实例化一个TimeSpan


   //把分隔成数组的日期传进DateTime中，组成的日期格式如：1/2/2001


    DateTime dtIssueDate=new DateTime(int.Parse(strStartDate[0]),int.Parse(strStartDate[1]),int.Parse(strStartDate[2])); 


    DateTime dtMaturityDate=new DateTime(int.Parse(strEndDate[0]),int.Parse(strEndDate[1]),int.Parse(strEndDate[2])); 




    tsIssueDays=dtMaturityDate-dtIssueDate;  //两个日期相减得到一个DateTime的实例tsIssueDays


                 


    retValue=tsIssueDays.Days + 1;   //获得DataTime的天数


   }