[rrd-users] Working with an old time series (1951-1989)

[Tobias Oetiker]

Hi Fernando,

Today Fernando Di Nucci wrote:

> I have some time series spanning from 1.1.1951 to 12.31.1989 worth to be
> analyzed and plotted using rrdtool.
> To avoid negative timesamps before the epoch, I thought to shift
> everything 28 years above (1.1.1979 - 12.31.2017).
> The constant 28 has been chosen to preserve such information like the
> days of the week that are the same after 28 years.
>
> But when I try to create the archive starting at 12/31/1978 rrdtool
> (tried both ver 1.3.1 and 1.2.15) refuses to do its job complaining:
>
> ERROR: start time: did you really mean month 283906800?
>
> Is there a way to persuade it that yes, I really mean month 283906800 ?
>
> Trying to start from 12/31/1979 it works, but I'd need one year before.
>
> I can't shift 56 years because I'd end up in 2045 > 2038 with an invalid
> timestamp again.

hmmm the block for dates before 1980 is sort of arbitrary, so you
might be able to make rrdtool work alright even when you remove it
(some hacking required) ...

it is all related to the old (and badly in need of refactoring AT
style time parsing code ... )

cheers
tobi
>
> Any idea welcome, and thank you in advance.
>
> Fernando Di Nucci
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900