How about something like: > data$DateTime<- strptime(paste(data$day.hour,data$min.sec,sep=" > "),format="%j%H %M%S") > data$Date <- strftime(data$DateTime,format="%Y-%m-%d") > data$Time <- strftime(data$DateTime,format="%H:%M:%S") > data day.hour min.sec DateTime Date Time 1 12517 2034 2011-05-05 17:20:34 2011-05-05 17:20:34 2 12520 2004 2011-05-05 20:20:04 2011-05-05 20:20:04 3 12507 2045 2011-05-05 07:20:45 2011-05-05 07:20:45 4 12502 2000 2011-05-05 02:20:00 2011-05-05 02:20:00 5 12500 2004 2011-05-05 00:20:04 2011-05-05 00:20:04
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