?strptime will helps. > d <- as.Date("01/05/2007","%m/%d/%Y") > format(d, "%A, %b %d, %Y") [1] "Friday, Jan 05, 2007" ----- A R learner. -- View this message in context: http://r.789695.n4.nabble.com/From-date-to-week-day-tp2228954p2228992.html Sent from the R help mailing list archive at Nabble.com.