Or: weekdays(as.Date("2010-05-24")) HTH, Stephan Wu Gong schrieb: > ?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.