Query works in Query Designer but not in MS SQL Server Report Builder

Question

While using the Microsoft SQL Server Report Builder, I am able to execute a query in the Query Designer and retreive the result. The query has a where clause on dates.

select * from table where DB_timestamp > to_date(:StartDate, 'mm/dd/yyyy') and DB_timestamp <  to_date(:EndDate, 'mm/dd/yyyy')

On execution, I get a pop up where I enter the two variables (StartDate & EndDate) in the given formats. Now when I try to run the same for generating a report, I have to select the two variables using a calender picker. Altough the dates show up in the desired format, I always get the below error:

An error occured during local report processing.
 Query execution failed for dataset 'XYZ'.
ORA-01843: not a valid month

What can cause the query to run successfully in one place but throw an error when the variables are selected by the calender picker?

Answer 1

There mught be some kind of culture clash going on. If SSRS is sending dd/mm/yyyy and your db is expecting mm/dd/yyyy things will not work as expected or even crash on certain dates.

Answer 2

I would remove the to_date function from the where clause, e.g.

where DB_timestamp > :StartDate and ...