Re: [R] datetime on x-axis of plot

From: Don MacQueen <>
Date: Thu, 28 Feb 2008 15:36:43 -0800

Is the date part of your data a POSIXct object?

If so,

   plot( myData[,1], myData[,2] )

will label the x axis with dates.

See the help pages for date-time class objects:


(POSIXt includes both POSIXct and POSIXlt; I tend to prefer POSIXct and find it the easier of the two to work with, overall)


At 1:04 PM -0800 2/28/08, joshv wrote:
>Hello, I'm reading Time Series Analysis and its Applilcations with R Examples
>and I have a question...
>I notice that in the book there are timeseries plots but without the x-axis
>being labeled with dates. They are just numbers 1,...50,...100, etc. How
>do I get the date to show up on the x-axis?
>Here is my dateframe:
>> head(myData, 5)
>1 2008-01-30 08:30 7.00
>2 2008-01-30 08:32 9.25
>3 2008-01-30 08:34 5.50
>4 2008-01-30 08:36 5.00
>5 2008-01-30 08:38 -26.25
>(Also, I have searched using and not found anything to help me.
>Any searching advice would be greatly appreciated.)
>View this message in context:
>Sent from the R help mailing list archive at
> mailing list
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA

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Received on Thu 28 Feb 2008 - 23:41:28 GMT

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