public static long get_peak_duration(Date begin_time,long duration)
    {
      //默认duration时间小于28天
      Date end_time;
      long start_h, start_m, start_s,end_h, end_m, end_s; 
      long start, end;
      long days,h,m,s; 
      long p, np=(24-7)*3600;//p---时长  np---n 天的时长
      days = (duration/3600)/24;
      if (days > 27) 
      {
        System.err.println("-----通话时间溢出-----");
        System.exit(-1);
      } 
      h = (duration/3600)%24;
      m = (duration%3600)/60;
      s = duration%60;
      Calendar times = Calendar. getInstance();;
      times.setTime(begin_time);
      start_h=times.get(Calendar.HOUR_OF_DAY);
      start_m=times.get(Calendar.MINUTE);
      start_s=times.get(Calendar.SECOND);
      end_s=(start_s+s);
      end_m=(start_m+m);
      end_h=(start_h+h);
    /**/  System.out.println("start time "+start_h+" "+start_m+" "+start_s);
      if (end_s>=60)
      { 
        end_s=end_s-60;
        end_m++;
      }
      if (end_m>=60)
      { 
        end_m=end_m-60;
        end_h++;
      }
      if (end_h>=24)
      { 
        end_h=end_h-24;
        //days++;
      }
    /**/  System.out.println("end times "+end_h+" "+end_m+" "+end_s);
      System.out.println("days "+days);
    //  System.out.println("start_h="+start_h+"end_h="+end_h);
      np=np*days;
      start=start_h*3600+start_m*60+start_s;
      end=end_h*3600+end_m*60+end_s;
      if (start>=0&&start<7*3600)
      {
        if (end<start)
          p=(24-7)*3600+np;
        else if (end>=start&&end<7*3600)
          p=np;
        else
          p=(end_h-7)*3600+end_m*60+end_s+np;
      }
      else
      {
        if (end>=start&&end<24*3600){
          p=(end_h-start_h)*3600+(end_m-start_m)*60
            +(end_s-start_s)+np;
          System.out.println;
        }
        else if (end<7*3600)
          p=(24-start_h)*3600+(0-start_m)*60
            +(0-start_s)+np;
        else 
          p=(24-start_h)*3600+(0-start_m)*60
            +(0-start_s)
           +(end_h-start_h)*3600+(end_m-start_m)*60
            +(end_s-start_s)  
            +np;
      }
      
      return p;
      
    }