Plotting time of day vs date example

yourmom.gplot

#!/usr/bin/gnuplot

set term png
set output "yourmom.png"
set terminal png size 600,300

set grid nopolar

# example
# Aug 24 2010,01,21,username
set xdata time
set timefmt "%b %d %Y"
set datafile separator ","
#set format x "%Y-%m-%d %H:%M:%S"
set format x "%Y-%m-%d"
#set xtics 86400
set ytics 1
set yrange [0:24]
plot 'yourmom.dat' using 1:($2 + ($3 / 60.0)):(86400):(0) with vectors nohead notitle