我目前有一個dataframe，我想把裡面其中一個coloum從character轉換成date 但是我只要一轉，他就會全部變成NA，我把locale調成LC_TIME C也沒有作用 想請問有人碰過同樣的情形或者有解法嗎? 這是轉換後的warrning 補上範例檔案，因為是商用檔案所以把個資都刪除了 https://drive.google.com/open?id=0B3xY9FMzjybzSUt5TTNOWERicmM 語法是 as.Date(訂單日期)->xxd$訂單日期 Warning message: In grepl("|||", what, fixed = TRUE) : input string 1 is invalid in this locale 這是我的session info R version 3.2.5 (2016-04-14) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows >= 8 x64 (build 9200) locale: [1] LC_COLLATE=Chinese (Traditional)_Taiwan.950 LC_CTYPE=Chinese (Traditional)_Taiwan.950 LC_MONETARY=Chinese (Traditional)_Taiwan.950 [4] LC_NUMERIC=C LC_TIME=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] tidyr_0.4.1 recommenderlab_0.1-9 registry_0.3 proxy_0.4-15 arules_1.4-1 Matrix_1.2-6 gtools_3.5.0 [8] dplyr_0.4.3 plyr_1.8.3 loaded via a namespace (and not attached): [1] Rcpp_0.12.5 lattice_0.20-33 assertthat_0.1 grid_3.2.5 R6_2.1.2 DBI_0.4-1 magrittr_1.5 irlba_2.0.0 tools_3.2.5 [10] parallel_3.2.5 --

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