At 04:54 PM 19/12/2009, you wrote:

>Hello Helen and others,
>
>I am really sorry. Now I understood the matter. Initially I got confused with Time stamp data as I was not getting the required values when I take difference between two time stamp values. That is why I decided to use date and time separately.
>
>Now I am going to use only time stamp.
>
>By the way, the difference you get between two time stamp values is in days (helen, you had indicated that the difference should be divid by 24, but it should be multiplied by 24).

Yes, good catch!

./hb