[rrd-users] Re: Graphs shifted back in time

[Alex van den Bogaerdt]

Michel Blanc wrote:

> I have a proble when I graph data. The x axis is shifter back in time by
> six hours.
> The data plotted is correct, but the values for noon, for instance,
> appear at 6AM.
> 
> The data in the database has correct timestamp, correct timezone, and
> the machine has a correc date.

Most likely the webserver doesn't know about the correct timezone.
The timezone is *not* stored in the database.

Create a small cgi script that only returns the date and time. For
instance, using bash:

    #!/bin/bash

    echo 'Content-type: text/plain'
    echo
    date -u
    date

Put this inside your cgi-bin directory, don't forget to chmod 755.
Also do not forget to remove it after you ran the test.

It should print the time (and date) twice, one for UTC time and one
for local time.

You seem to be living in the same timezone as I do; if so, the
difference should be one hour (local time being ahead of UTC).

Two handy links:
http://liftoff.msfc.nasa.gov/Academy/Rocket_Sci/clocks/time-gmt.html
http://sunearth.gsfc.nasa.gov/eclipse/SEhelp/TimeZone.html

cheers,
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