David, veja se te ajuda. library(R.utils) lines <- " 5928671,14,-3.831290,-38.50146,2015-02-01 00:00:01 5926098,44,-3.709390,-38.58986,2015-02-02 00:01:13 5915217,145,-3.743671,-38.48788,2015-02-03 00:01:16 5444641,174,-3.766271,-38.57452,2015-02-01 00:01:38 2250561,977,-3.738654,-38.48400,2015-02-02 00:01:47 5671754,14,-3.831290,-38.50146,2015-02-03 00:02:43 " con <- textConnection(lines) df <- read.csv(con, header = F) close(con) *dias <- unique(as.Date(df[, 5]))* *for (i in 1:length(dias)) {* dfi <- df[as.Date(df[, 5]) == *dias[i]*, ] diretorio <- paste(getwd(), "rsc/data", format(*dias[i]*, format = "%Y-%m-%d"), sep = "/", collapse = "") mkdirs(diretorio) write.csv(dfi, paste(diretorio, "saida.csv", sep = "/", collapse = "")) }