[R] date format conversion problem

Ben Bolker bolker at ufl.edu
Wed Oct 10 20:14:35 CEST 2007

Joao Santos-7 wrote:
> Hello,
> I problem is in the format of the date, my time series is like this:
> [snip]
> When I attempt to format the time like this:
> A <- read.table("file", sep="\t", col.names=c("date", "my1", "my2",
> "my3"))
> temp <- as.Date(A$date, format="%Y%m%d%H")
> temp
> I get
>   [1] "4403-05-21" "4403-05-22" "4403-05-23" "4403-05-24" "4403-05-25"
> [snip ...]

 I saved your data (in a space-separated format rather than
tab-separated, but that shouldn't matter)

A <- read.table("timeser.dat",
                col.names=c("date", "my1", "my2", "my3"))

temp <- as.Date(as.character(A$date), format="%Y%m%d%H")

  Oddly enough, when I do 

as.Date(A$date, format="%Y%m%d%H")



  I get

Error in as.Date.default(A$date) : 
  do not know how to convert 'A$date' to class "Date"

  rather than a nonsensical answer -- what version of R
are you using?  (e.g. what are the results of sessionInfo() ?)
Although it looks like the results you get might be the results of
translating numeric directly into a date ... ?

 [thanks for the reproducible example, but (1) R version and
(2) meaningful subject line would be nice.  Also, good to specify
that regul() is from the pastecs package ]

  Ben Bolker

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