Here it is: zz <- strptime(zip.df$Time,"%Y-%m-%d %H:%M:%S") > plot(zz,zip.df$TempC,type="l") > Woo Hoo! Thanks though! Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodgess at gmail.com