[rrd-users] Daily statistics - midnight local vs UTC

Larkin Lowrey llowrey at nuclearwinter.com
Sat Nov 11 16:28:45 MET 2006

Hello, I am trying to record daily averages and am running into a
problem where rrdtool thinks that the day begins at midnight UTC instead
of midnight localtime (CST). I remember encountering this problem
several years ago but can't remember the solution. I'm a bit surprised
this is still an open issue.

What is the magic trick?

Here's what I used to create the database.

rrdtool create mailstats.rrd \
        --step 3600 \
        DS:rejected:COUNTER:7200:U:U \
        DS:spam:COUNTER:7200:U:U \
        DS:passed:COUNTER:7200:U:U \
        RRA:AVERAGE:0.5:1:744 \
        RRA:AVERAGE:0.5:24:730 \
        RRA:MIN:0.5:1:744 \
        RRA:MIN:0.5:24:730 \
        RRA:MAX:0.5:1:744 \

When I do a dump of the rrd I get entries like the following:

<!-- 2006-11-02 18:00:00 CST / 1162512000 --> <row><v> NaN </v><v> NaN
</v><v> NaN </v></row>
<!-- 2006-11-03 18:00:00 CST / 1162598400 --> <row><v> NaN </v><v> NaN
</v><v> NaN </v></row>
<!-- 2006-11-04 18:00:00 CST / 1162684800 --> <row><v> NaN </v><v> NaN
</v><v> NaN </v></row>


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