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Why can not convert to a datetime data typee?

Posted By:      Posted Date: April 10, 2011    Points: 0   Category :
When I exec the following procedure, I always recieve the following error message.
Is it possible to use sp_Executesql? How can I use it in this procedure?

Msg 8114, Level 16, State 5, Procedure tsc_case_get_query_list_dba, Line 0
Error converting data type varchar to datetime.

USE [clearview_v2_dev]
/****** Object: StoredProcedure [dbo].[tsc_case_get_query_list]  Script Date: 04/05/2011 17:31:00 ******/

-- ==================================================
-- Author:		<Author,,Name>
-- Create date: <Create Date,,>
-- Description:	get published testcase in master tab
-- ==================================================
ALTER PROCEDURE [dbo].[tsc_case_get_query_list]
    @testcase_id int = null        --when testcase_id is 0, means get all root level testcase only 
   , @keywords varchar(200) = null
   , @step_status_ids varchar(100) = null
   , @severity_ids varchar(255) = null   --multiple sevrity ids, format is:1,2,3
   , @date_range_start datetime = null
   , @date_range_end datetime = null
   , @cust_ids varchar(100) =null 
   , @prj_ids varchar(100) = null
   , @app_ids varchar(100) = null  
   , @user_id int


declare @num_rec int
declare @access_level int
declare @one_item_id int,@level int
declare @rtn_cnt int
declare @root_testcase_id int
declare @sqlstr v

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