There is an example ( I checked LabVIEW 6.1 ) that writes waveform data to Excel with the time column. Here's how to find it.
Go to the Help menu to start and follow this path.
Help -> Find Examples ...
... on the Browse tab ...
Fundamentals -> Waveforms -> "Export Waveforms to Spreadsheet File Example.vi"
When you run the example you are prompted with a file dialog. Enter the name of a spreadsheet file (include the ".xls"). It creates a bunch of waveform data, but you should substitute it with your own.
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Daniel L. Press
PrimeTest Corp.
www.primetest.com