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From: =?ISO-8859-1?Q?Hans-Bernhard_Br=F6ker?= <HBBroeker@t-online.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: date/time format
Date: Sat, 14 Apr 2012 17:48:07 +0200
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On 14.04.2012 17:00, TonyG wrote:
> On Apr 13, 6:27 pm, Hans-Bernhard Bröker<HBBroe...@t-online.de>
> wrote:

>>          set timefmt "%m-%d %H:%M:%S"

> set timefmt "%M-%D %H:%M:%S"

Does that look exactly like the format I showed you?  What do you think 
the difference will do?

> I'm still getting a time formatting error for each of the tens of
> thousands of lines or
>
> gnuplot>  plot 'output.csv' using ($1):($3)
>                                            ^
>           all points y value undefined!

You usually don't want to use '($1)' for time data. Stick to the simpler 
'1' instead.