> df$dt <- as.Date(df$t) Thank you, David, but I need a *time* value. "day" was a confusing special case; how about "min"? -- View this message in context: http://r.789695.n4.nabble.com/Lost-in-POSIX-tp3052768p3053146.html Sent from the R help mailing list archive at Nabble.com.