[R-sig-Geo] create a raster time series with negative years (years Before Present)

[Jackson Rodrigues]

Hey guys,

I need some help to set a time serie (ts) to raster stack, however my
raster serie has negative ages (years Before Present (yrBP)).

I have tried several codes and packages unsuccessfully.

If succeed, I would like to apply seasonal and other calculations to my
new  raster time serie.

Below are some codes from package rts. I adapted years to negative value
only as a example.

#####
>path <- system.file("external", package="rts") # location of files
>lst <- list.files(path=path,pattern='.asc$',full.names=TRUE)
>lst # list of raster files
>r <- stack(lst) # creating a RasterStack object
>r
>d <- c("-2000-02-01","-2000-03-01","-2000-04-01","-2000-05-01") #
corresponding dates to 4 rasters
>d <- as.Date(d) # or d <- as.POSIXct(d)
Error in charToDate(x) :
  character string is not in a standard unambiguous format
>rt <- rts(r,d) # creating a RasterStackTS object
>rt
>plot(rt)
#########

best,

Jackson Rodrigues
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