[rrd-users] Question about RRDTool ..

Simon Hobson linux at thehobsons.co.uk
Thu Mar 20 15:00:16 CET 2008

Jean-Yves Avenard wrote:

>  >Lastly, it's a good idea to explicitly round your graph end time to
>>be exactly on the end of a step boundary, and your start time to be
>>exactly an integer number of steps before the end.
>Is there a way to display the graph using the rounded end-time to a
>multiple of the period (timestamp that will be in GMT), but to display
>the legend in local time instead?

GNU date :

%s   seconds since 1970-01-01 00:00:00 UTC

so in bash :

End=`date +%s`
End=$(( ${End} / ${Step} * ${Step} ))
Start=$$( ${End} - ( ${Step} * ${Pixels} ) ))

then you can do :

rrdtool graph ... -s ${Start} -e ${End} -w ${Pixels} ...

I believe the legend will use the local timezone if configured. Try a 
search of the archives, it's been mentioned not too long ago IIRC.

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