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I have multiple pictures in a folder and each picture has a timestamp (in linux format) in it's name. I have provided an example of a timestamp on line3. My line 3 runs fine. But I get an error with 4th line. any hints?

my error is

Error in as.POSIXlt.character(x, tz, ...) : 
  character string is not in a standard unambiguous format

filenames=list.files("//somepath/pictures")
timevalues=substr(filenames,8,17)
dates=as.POSIXct(1421679269, origin="1970-01-01")
dates2=as.POSIXct(timevalues, origin="1970-01-01")
dates
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