> kew <- read.table("D:\\kew.txt", header=T)
> kew
> Sys.setlocale("LC_TIME", "C") #set the time zone;
从下一步开始什么都没出现了
> kew$date <- as.Date(paste(1, kew$Month, kew$Year), format="%d %b %Y")
> kew$month <- substr(as.character(kew$date),6,7)