Hello, This just came up in SO, sessionInfo() at the end.
https://stackoverflow.com/questions/50988018/seeking-explanation-for-as-date-function-in-r?noredirect=1#comment88971055_50988018 # example 1 # not even the month is right as.Date(x = 1, format = '%j', origin= '2015-01-01') #[1] "2018-07-21" # example 2a # nonsense output as.Date(x = 1, origin= '2015-01-01') #[1] "2015-01-02" # example 2a # nonsense output, see example 6 below as.Date(x = 1, origin = as.Date('2015-01-01')) #[1] "2015-01-02" # example 3 # I know that the method as.Date.numeric doesn't have # argument 'format' but does have the dots argument. # The format is passed on to strptime so maybe the problem is there. as.Date(x = 1, format = '%j', origin= as.Date('2015-01-01')) #[1] "2015-01-02" # example 4 # Wrong, documented. # origin should be automatically coerced to class 'Date' # This is documented to behave like example 6 below as.Date(x = '1',format = '%j', origin= '2015-01-01') #[1] "2018-01-01" # example 5 # right, documented. x of class 'character' needs argument 'format' as.Date(x = '1', origin= '2015-01-01') #Error in charToDate(x) : # string de caracteres não é um formato padrão não ambíguo # example 6 # the safe way, the only one that outputs the right date as.Date(x = '1', format = '%j', origin= as.Date('2015-01-01')) #[1] "2018-01-01" sessionInfo() R version 3.4.4 (2018-03-15) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 16.04.4 LTS Matrix products: default BLAS: /usr/lib/libblas/libblas.so.3.6.0 LAPACK: /usr/lib/lapack/liblapack.so.3.6.0 locale: [1] LC_CTYPE=pt_PT.UTF-8 LC_NUMERIC=C [3] LC_TIME=pt_PT.UTF-8 LC_COLLATE=pt_PT.UTF-8 [5] LC_MONETARY=pt_PT.UTF-8 LC_MESSAGES=pt_PT.UTF-8 [7] LC_PAPER=pt_PT.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=pt_PT.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods [7] base loaded via a namespace (and not attached): [1] compiler_3.4.4 tools_3.4.4 yaml_2.1.19 Or maybe I am missing something. Thanks in advance, Rui Barradas ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
