[rrd-users] Re: Correcting for GMT lag on daily values

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Sep 6 12:46:23 MEST 2002

On Fri, Sep 06, 2002 at 05:46:04AM -0400, Claude R Trepanier/Bromont wrote:

> If your RRD start time is midnight GMT and you feed rrdtool with a
> timestamp of midnight GMT every day you will get the actual values in the
> database.

I prefer to use the term "UTC" as opposed to GMT.  This makes it
more clear that the time is universal whereas some people may be
confused by GMT -> BST transitions.

The "start time" of an RRD will automatically be set to a number
equalling a whole amount of "stepsize" seconds.

This is just the way it works.  You cannot set it to any other time,
if you try you will be silently ignored.

If you feed all values to RRDtool at a suitable time (in this example's
case: n*86400 where n is a whole number) then yes, the values in the
database will not need to be normalized.

However, you also need to *query* the database with suitable times.
So, "--end mignight --start end-2d" will not do unless your system
happens to run at UTC time.


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