[rrd-users] Re: Manipulating .rrd files especially timestamp

Serge Maandag serge.maandag at staff.zeelandnet.nl
Tue Jan 18 14:02:46 MET 2005

> Every 24 hours a cronjob adds the availability of a host to a 
> .rrd file which means usually the value 100 is added. The 
> jobs runs at 1:00 a.m. but i pass to rrdtool update the 
> timestamp of the previous day at 23:59:59.
> Later i fetch the values out of the .rrd file but what i get 
> as the timestamp is 1:00 a.m. of the next day that means the 
> time when the cronjob runs.

You are updating once a day, but you are in timezone GMT + 1.
Subtracting 1 hour is not the way you'll want to go since it will
Give you headaches with daytime saving.

It's a topic that has been discussed quite often before.
Here's a pointer:

Or http://tinyurl.com/6o5wm


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