This could be entirely a coincidence, but the values I see are extremely 
close to the number of days since 1900/1/1.

On Sunday, June 2, 2013 2:56:08 PM UTC-4, Will Nathan wrote:
>
> I was wondering what X value is used when implementing trend-lines on a 
> DateTime column type. For example, Tuesday April 16 2013 on the equation 
> exp(0.007*x - 274.385) is used to arrive at 22.618. Unix/Epoch Timestamps 
> make sense, but plugging them into x doesn't get anywhere near the proper 
> value.
>
> Thanks!
> Will
>
> https://developers.google.com/chart/interactive/docs/gallery/trendlines
>

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