Hi, 
if I plot the same data on a LineChart using Date on the x-axis I get a 
different result when using an "index" on the x-axis.
For example if I plot
["2015-04-26T15:00:00", 46.20]
["2015-04-26T17:00:00", 43.23]
["2015-04-26T19:00:00", 52.25]
["2015-04-27T09:00:00", 96.19]
["2015-04-27T10:00:00", 41.65]

I get a different result when plotting

[0, 46.20]
[1, 43.23]
[2, 52.25]
[3, 96.19]
[4, 41.65]

It seems that some data are removed when using date.
Also: when using date the trendline does not work properly

Here is my code: http://pastebin.com/pMKNZUSM
What's wrong?

In the following pictures the dataset used is the same. Note that the 
trendline in both graph is polynomial with 10 degree

<https://lh3.googleusercontent.com/-ymafsIis550/Vlgm1WiiSZI/AAAAAAAAAsc/LPhDCCk0HTU/s1600/ok%2B-%2BCopia.PNG>

<https://lh3.googleusercontent.com/-qoZuAo8aS98/Vlgm5rw6LJI/AAAAAAAAAsk/UW7AP2hBeJI/s1600/nok%2B-%2BCopia.PNG>


PS: sorry for my english: is not my native language :)

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