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How to read time stamps from a spreadsheet and calculate the difference between consecutive time stamps?

Hi,
 
I am new to Labview. This question might be a joke to some of you here, but any help would be greatly appreciated. I have a spreadsheet with time stamps and power outputs from a generator. I am supposed to calculate the difference between consecutive time stamps, which will act as a delay for the next power output update that needs to be sent. For example, lets say that I have to following data:
 
Time Stamp                    Power Output
11:00:00 AM                       3kW
11:00:02 AM                       2.9kW
11:00:04 AM                       3.2kW
11:00:06 AM                       3.1kW
 
The above data doesn't make any sense, but it is just for the purpose of this question.
 
So, I have to read 11:00:00 AM and 3kW initially - 3kW is the initial request that is sent.
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Please view http://forums.ni.com/ni/board/message?board.id=170&message.id=294435

Regards,
Juan Galindo
Applications Engineer
National Instruments
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