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

[Serge Maandag]

> 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:
http://groups-beta.google.com/group/mailing.unix.rrd-users/browse_thread
/thread/fcc75adffa0394f4/2c53449f347b54e5?q=rrdtool+update+daily+3600+86
400&_done=%2Fgroups%3Fhl%3Den%26lr%3D%26q%3Drrdtool+update+daily+3600+86
400%26qt_s%3DSearch+Groups%26&_doneTitle=Back+to+Search&&d#2c53449f347b5
4e5

Or http://tinyurl.com/6o5wm

Serge.

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