Thanks Henrique, Do you have any idea why the first entry doesn't have the time as the start specified is "1/1/1981 00:00"? Is it something to do with being at midnight? Doug -- View this message in context: http://r.789695.n4.nabble.com/Date-Time-Objects-tp2993524p2993640.html Sent from the R help mailing list archive at Nabble.com.