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From: Michael Okuntsov <proximum@land.ru>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Datafile with AM/PM in time-series
Date: Tue, 17 Mar 2015 21:46:01 +0600
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16.03.2015 22:03, cassini01@live.com пишет:
> Hi,
>
> I want to plot a time-series datafile in which the time is specified as follows:
>
> ...
> 3/12/2015	11:59:45 PM
> 3/12/2015	11:59:50 PM
> 3/12/2015	11:59:55 PM
> 3/13/2015	12:00:00 AM
> 3/13/2015	12:00:05 AM
> 3/13/2015	12:00:10 AM
> ...
>
>
> How to plot with correct X-axis timeformat ?
> (%p seems to be an am/pm specifier only for the output, not for the input datafile, correct ?)
>
> Many thanks
>

Seems that you can't do it within gnuplot. You can convert your series 
to 24h format the same way as it was answeded here:

http://stackoverflow.com/questions/440061/convert-12-hour-date-time-to-24-hour-date-time

Generally speaking, it's a bad idea, to use AM/PM notation in technical 
data.