domion OA java代理如何写日期区间条件判断？

Database db=session.getDatabase("", "A.nsf");
formula = " Form='mainform' & @TextToNumber(sys_SuperUserdeal) != 1 & @TextToNumber(sys_SoftDelete) != 1 & @TextToNumber(Status_Type) = 2";
formula += " & SYS_SUBMITDATE >= @TextToTime(" +bdate+ ")";
formula += " & SYS_SUBMITDATE <= @TextToTime(" +edate+ ")";

bdate、edate传入的格式是字符串为2017-08-01
formula条件取不出数据来，将日期区间条件去掉则可以取出数据,这是为什么呢？我写出错了？？？