By using Active X or the NI LabVIEW Report Generation Toolkit you can match your timestamps in LabVIEW with your timestamps in Excel.
Community member GriffinRU has a great example on programmatically transferring data from Excel to LabVIEW. Transferring data from a cell to LabVIEW can be done a number of different ways but GriffinRU's take on copying the information to a LabVIEW Front Panel Table object and also maintaining the cell formatting is nice. I can't tell you how many times I had to go back by hand and change the formatting by hand after moving information from Excel to LabVIEW.
Check out GriffinRU's example on From Excel To LabVIEW With Style.