[rrd-users] How can I graph a line with old data?

[misipino]

I need to compare the values of the current day with the values of same day
of last week.
Using the command "rrdtool fetch" the answer is a type number:

1266407100: 3.3986666667e +01


This does not seem a valid value for Cacti.

How can I make it a valid number for Cacti?

Anybody know a script that makes the extraction of data from an rrd file and
submit it as an integer?

Thx
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