[Gnuplot-info] Time plots in v4.0

[Shanks N <sha...@gm...>]

How do I get y, y+delta plots of these job runs

#date      strt   end
19-03-2006 21:00 21:08
20-03-2006 21:00 21:16
21-03-2006 21:00 21:13
22-03-2006 21:00 21:08
23-03-2006 21:00 21:12
24-03-2006 21:00 21:13
25-03-2006 21:00 21:19
26-03-2006 21:00 21:13

My attempts like

set terminal jpeg
#set timefmt "%d-%m-%Y"
#set xdata time
#set format x "%b %d"
set timefmt "%H:%M"
set ydata time
plot "time.dat" using 1:2:3 with errorbars
plot "time.dat" using 1:2:3 with errorlines

are not giving the right results.  Basically, trying to plot the run 
times of a job on a monthly basis.  Somehow got it into my head, that 
errorlines/bars are the way to go. If this is the wrong way, what's the 
corect method?

& is it possible to do time arithmetic in gnuplot?

regards,
Shanks