how to set range for time data

[barbucha]

Hello,
I have gnuplot 4.2 patchlevel 5 installed on kubuntu 9.10.
I have problem with setting range for time data

Data below generate graph with right range, but without data lines.
When I comment rows
#set timefmt "%s"
#set xdata time
#set format x "%d.%m %H:%M"
everything works fine, i can show data lines

#set terminal png transparent size 900,500
set nomxtics
set timefmt "%s"
set xdata time
set format x "%d.%m %H:%M"
set format y "%.2e"
set ylabel " value "
set xlabel "time"
set xtics rotate by 90
set key outside top right Left reverse samplen 1 enhanced autotitles
set bmargin 10
set grid
set xrange [1260955844 to 1261008000]
set yrange [28.45528:38.8317372]

plot '-' using 1:2 title " H2_RCH-105 [] " w lines, '-' using 1:2
title " H2_RCH-205 [] " w lines
1260955844 28.949
1260956024 28.753
1260956203 28.949
1260956384 28.753
1260957284 28.851
1260957464 28.851
1260957643 28.949
1260957824 28.949
1261006243 28.851
1261006424 28.851
1261006604 28.655
1261006784 28.655
1261006964 28.753
1261007144 28.655
1261007324 28.753
1261007503 28.753
1261007684 28.655
1261007864 28.753
e
1260955964 38.435
1260956084 38.435
1260956264 38.435
1260956443 38.435
1260996584 38.631
1260996764 38.729
1260996944 38.631
1260997124 38.631
1260997304 38.729
1261006844 38.729
1261007024 38.729
1261007204 38.729
1261007384 38.729
1261007564 38.729
1261007743 38.729
1261007923 38.729
e

[barbucha]

after many hours i solved this problem

values in set xrange [] for time data means
number second from 2000-01-01 00:00:00, not from 1970-01-01