Xentop Batch Time Display Help

I would like to be able to display the local time (or anytime for that matter) when I run Xentop in batch mode. Is that possible? (In other words, when I look back at the data, I want to be able to tell what time that the output was displayed).

Can you just write a timestamp to the file before you call Xentop:

echo `date` >> timestamp.txt

That doesn't exactly give me the output I would like, since I'm having xentop display the cpu every second and I want the time displayed each time since I want to later extract all the data and place it into an excel sheet.