日付(Date) → 文字列(character)はstrftime 関数
関数名覚えられないマン。
> today <- Sys.Date() > class(today) [1] "Date" > today [1] "2015-12-26" > strftime(today, format="%Y%m%d") [1] "20151226" > class(strftime(today, format="%Y%m%d")) [1] "character"
関数名覚えられないマン。
> today <- Sys.Date() > class(today) [1] "Date" > today [1] "2015-12-26" > strftime(today, format="%Y%m%d") [1] "20151226" > class(strftime(today, format="%Y%m%d")) [1] "character"