Converting date time string to double data

I have to plot a bar chart. The VI accepts only 2-d double data. My X- axis is date timestamp and Y- axis is the double data.
Bt I am unable to convert the timestamp value to double.
Anyone can suggest anything ?
Regards,
Runjhun.

Thnx a lot Darin.
Bt may be I should be more clear with my reqmts.
In the image attached the data to be plotted is stored in Excel from LabVIEW.
And the graph is plotted in Excel selecting the data.
Plotting of graph is maual.
I want that the graph plotting should be automatic.
In RGT der's a function Excel Plot Graph bt the problem is dat it takes only 2d double array as I mentioned earlier.
May be dis wil make my problem clearer.
Regards,
Runjhun A.
Attachments:
plot_type.jpg ‏3724 KB

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