datalog and display

Hi

This is a 2 part Q. 

1. I acquire data from sensors and store them to an excel file using report gen toolkit

2. I retrieve data from the excel file and display them on a graph

I've hit a roadblock. (1)How do i copy the timestamp to the excel file and (2) get it the t0 and dt info so that i can feed them to a waveform generator which goes into a graph.

If there is an alternative pls do mention it.

Thanks in advance