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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Change time scale yaxis
Date: Wed, 5 Oct 2022 10:04:54 +0200
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Am 26.09.2022 um 22:22 schrieb scandari:
> Hello, I'm new to gnuplot. Want to obtain this sort of plot: https://i.stack.imgur.com/VV4Ex.png
> This is my code but I can't change y scale :(
> ----------
> $TIMES << EOT
> 2019-01-08 00:14
> 2019-05-08 03:14
> 2019-05-07 22:08
> 2019-08-07 22:08
> EOT
> 
> set xtics time format "%m/%d"
> set ytics time format "%H:%M"
> set xlabel "Date (mm/dd)" font "Times, 12"
> set ylabel "Time Of Day(hh:mm)" font "Times, 12"
> set key tmargin reverse Left
> 
> set xrange [strptime("%Y-%m-%d","2019-01-01"):strptime("%Y-%m-%d","2019-10-30")]
> 
> plot $TIMES using (timecolumn(1,"%Y-%m-%d")) : (timecolumn(2,"%H:%M")) with points
> -----------
> Do you have suggestions? Thanks.

Hope there is no typo in the below:

wrap(x) = (x>12 ? x-24 : x)

set yrange [-13*3600:13*3600]
set ytics (-12 "noon", -6 "6pm", 0 "midnight", 6 "6am", 12 "noon")

plot $TIMES using (timecolumn(1,"%Y-%m-%d")) : 
(wrap(timecolumn(2,"%H:%M"))) with points, 0 dt 2