Hi, I am trying to use rect (R2.11) to plot a set of data as following Company Pt Pri Pub A W200 4/5/2009 3/11/2010 B W293 2/30/2003 3/24/2005 A W258 2/8/2008 8/17/2010 C W248 5/13/2009 1/2/2010 %y <- seq(0,0.5*(length(company)-1),0.5) %h <- 0.1 %rect(pri, y-h, pub, y+h, col=c("light blue","pink","yellow","red")) I wonder if there is a good way to deal with the date conversion so the x-axis can reflect the actual time range. Thank you, Eric [[alternative HTML version deleted]]