[rrd-users] graph for 7 day active window

[cK]

Hi,
 
 I collect the data once a day and display the graph using:
 rrdtool graph total_day.png \
     --alt-autoscale \
     --start -6month \
     --step 86400 \
     --title "Total" \
     --vertical-label "Total" \
     DEF:gmv=total_day.rrd:total:AVERAGE \
     LINE2:gmv#0000FF:"Total"
 
 Now the X-Axis is labeled by month (default?). How can I create a graph for 7 days active window or 30 days active window?
 
 Thanks for any hint!
 
 Chris
		
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