C# SQL Date Query

Good day all,

I am trying to create a dynamic report to produce the time it take between starting an activity and ending an activity.  I can get the information I am looking for by using SQL, but it will not limit the returns based on dates.  I have tried a few different ways to do this, but nothing is working for me.  Thanks for any help you can provide.

StringBuilder sql = new StringBuilder();
    sql.AppendLine(
        "Select " +
            "WP.name AS change, " +
            "WP.state AS status, " +
            "Act.name AS activity, " +
            "ClosedBy.keyed_name AS closed_by, " +
            "Act_Assign.created_on, " +
            "Act_Assign.closed_on, " +
            "Act_Assign.modified_on, " +
            "GETDATE() AS today, " +
            "DATEDIFF (d, [Act_Assign].created_on, [Act_Assign].closed_on) + 1 AS date_diff " +
        
        "FROM [Workflow_Process] AS WP " +
        
        "INNER JOIN [Workflow_Process_Activity] AS WPA ON WPA.source_id = WP.id " +
        "INNER JOIN [Activity] AS Act ON Act.id = WPA.related_id " +
        "INNER JOIN [Activity_Assignment] AS Act_Assign ON Act_Assign.source_id = Act.id " +
        "INNER JOIN [sm_Change] as Change ON Change.item_number = WP.name " +
        "LEFT OUTER JOIN [User] AS ClosedBy ON ClosedBy.id = Act_Assign.closed_by " +
        
        "WHERE WP.name = 'CR-1091' OR WP.name = 'CR-1169' " + // AND Act.name = 'ECR Approval' 
        "AND Act_Assign.modified_on BETWEEN '2023-08-01' AND '2023-08-02' " +
        
        "ORDER BY WP.name, Act_Assign.created_on ASC, Act_Assign.closed_on DESC "
    );

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