判断闰年、平年，28天，29天的计算方法，给出起年起月，止年止月，判断某一年的2月份的天数，并自动计算

              

             {起月起日查询}
              if    (StrToInt(Trim(ADOQuery_temp.FieldValues['qiyue']))=2) and (StrToInt(Trim(ADOQuery_temp.FieldValues['qiri']))=29)   then
              begin
                    if    DaysInAMonth(strtoint(Trim(Edit_niandu.Text)), 2)=28    then
                    begin
                          kaishiriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text)))+'-'+Trim(ADOQuery_temp.FieldValues['qiyue'])+'-'+'28'
                    end
                    else
                    begin
                          kaishiriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text)))+'-'+Trim(ADOQuery_temp.FieldValues['qiyue'])+'-'+Trim(ADOQuery_temp.FieldValues['qiri']);
                    end;
              end;
              if    (StrToInt(Trim(ADOQuery_temp.FieldValues['qiyue']))<>2) and (StrToInt(Trim(ADOQuery_temp.FieldValues['qiri']))<>29)   then
              begin
                    kaishiriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text)))+'-'+Trim(ADOQuery_temp.FieldValues['qiyue'])+'-'+Trim(ADOQuery_temp.FieldValues['qiri']);
              end;


              {止月止日查询}
              if    (StrToInt(Trim(ADOQuery_temp.FieldValues['zhiyue']))=2) and (StrToInt(Trim(ADOQuery_temp.FieldValues['zhiri']))=29)   then
              begin
                     //查询当月的月份天数
                    //瑞年
                    if    DaysInAMonth(strtoint(Trim(Edit_niandu.Text)), 2)=28  then
                    begin
                          jieshuriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text))+1)+'-'+Trim(ADOQuery_temp.FieldValues['zhiyue'])+'-'+'28';
                    end
                    //平年
                    else
                    begin
                          jieshuriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text))+1)+'-'+Trim(ADOQuery_temp.FieldValues['zhiyue'])+'-'+Trim(ADOQuery_temp.FieldValues['zhiri']);
                    end;
              end
              else
              begin
                    if    (StrToInt(Trim(ADOQuery_temp.FieldValues['qiyue']))=1) and (StrToInt(Trim(ADOQuery_temp.FieldValues['qiri']))=1)    then
                    begin
                          jieshuriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text)))+'-'+'12'+'-'+'31';
                    end
                    else
                    begin
                          jieshuriqi:=IntToStr(StrToInt(Trim(Edit_niandu.Text))+1)+'-'+Trim(ADOQuery_temp.FieldValues['zhiyue'])+'-'+Trim(ADOQuery_temp.FieldValues['zhiri']);
                    end;
              end;