[rrd-users] rrd starting at a certain date
Stefan M. Brandl
smb at r-kom.de
Tue Apr 13 11:29:39 CEST 2010
On Tue, Apr 13, 2010 at 10:19:32AM +0100, Simon Hobson wrote:
> Stefan M. Brandl wrote:
> > > Timezone ?
> >Seems not to be the problem.
> >If I set the start-date 3600 seconds higher or 3600 seconds lower,
> >the result is always the same. Startdate is always set to 1267056000 (look
> >in the resulting rrd-dump).
> >> Your email says +2 (European summer time ?), so midnight by your
> >> clock is 22:00 UTC. RRCTool only uses UTC.
> >> In any case, the start time in an RRD file is largely irrelevant.
> >I want a 1 week interval with data inserted every friday.
> I'd missed the step size of 604800.
> Because that's the way it works<period>. Every step starts on an
> integer multiple of step size since unix epoch. It's a design
> decision to work only in UTC which avoids the significant
> complications of working in a local (and changeable) timezones. I
> suppose it would be possible to add support for a fixed offset from
> Unix epoch - but I'm sure if that were added, it wouldn't be long
> before people started asking to be able to change it.
> 1267142400 misses that and so RRDtool rounds it until it does fit.
Ok, now I understand.
Thanks for the detailed explanation.
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