[rrd-users] rrd graph x-axis shift caused by --step

[Stefan Finzel]

Hi,
drawing one datapoint per day is shifting my graphs x axis by two hours 
(correlated to my local time zone CEST?) using --step 86400 by rrdtool 
create. There is no shift using --step 3600. Something obvious was 
missed here?

RRDtool 1.0.49

Ok:
rrdtool create test.rrd --step 86400 --start 1149458400 
DS:TOTAL:GAUGE:86400:0:U RRA:AVERAGE:0:1:400

Fails:
rrdtool create test.rrd --step 3600 --start 1149458400 
DS:TOTAL:GAUGE:86400:0:U RRA:AVERAGE:0:1:400

Data are created using the midnight timestamps of the local zone

rrdtool update test.rrd --template TOTAL 1149544800:1 1149631200:2 
1149717600:1 1149804000:2 1149890400:1 1149976800:2 1150063200:1 
1150149600:2 1150236000:1 1150322400:2 1150408800:1

Drawing was made  for a week/day by

rrdtool graph test.png --start 1149804000 --end 1150495200  
DEF:TOTAL=test.rrd:TOTAL:AVERAGE LINE2:TOTAL#000000:TOTAL

rrdtool graph test.png --start 1150322400 --end 1150452000 
DEF:TOTAL=test.rrd:TOTAL:AVERAGE LINE2:TOTAL#000000:TOTAL

Dependent of the setting of --step the x-axis is /not shifted. Using 
--step 3600 will enlarge my rrd files to keep the same time period, 
won't it?
I am not able/allowed to modify the environement variable TZ as it's 
setting is already used and required by the script.

TIA

Stefan

-- 
_________________________________________________________
        Stefan G. R. Finzel, Dipl. Phys. (Univ.)
  Ochsenkopfstr. 5, D-95478 Kemnath, +49 (0)9642 704448



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