Pretty hard to tell you how to fix your problem when you haven't said or shown how your program is written now. What are you using to write the data? Is it Write to Spreadsheet, Write LabVIEW Measurement File, Export Waveforms to Spreadsheet, or something else? Write LabVIEW Measurement gives you the option to write an empty time column. Export Waveforms only gives you the option of single time or multiple time column. Both of these are pretty limited in what kind of customizing you can do. A combination of some of the lower level fucntions such as Write to Spreadsheet, Write Characters, or just a Write File gives you the ability to customize any way you want.
