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set xdata time
set timefmt '%Y-%m-%d %H:%M:%S'
...
plot 'data' u 1:4 w lines title "min", \
         "" u 1:5 w lines title "avg", \
         "" u 1:6 w lines title "max"

  14 +----------------------------------------------------------------
+-----+   
     |    +     +    +     +    +    +     +    +    +     +    +     
++    |   
...
     |  #############$$$##############################################
+##   |   
   0 +----------------------------------------------------------------
+-----+   
   08/2008/20 08/2008/21 08/2108/2108/21 08/2108/2108/22 08/2208/22 08
+/2208/22