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    <p>How about this approach?</p> <pre><code>require("ggplot2") dtstring &lt;- c( "2011-09-28 03:33:00", "2011-08-24 13:41:00", "2011-09-19 16:14:00", "2011-08-18 11:01:00", "2011-09-17 06:35:00", "2011-08-15 12:48:00" ) dtPOSIXct &lt;- as.POSIXct(dtstring) # extract time of 'date+time' (POSIXct) in hours as numeric dtTime &lt;- as.numeric(dtPOSIXct - trunc(dtPOSIXct, "days")) p &lt;- qplot(dtTime) + xlab("Time slot") + scale_x_datetime(format = "%S:00") print(p) </code></pre> <p>The calculation, <code>dtPOSIXct - trunc(dtPOSIXct, "days")</code>, extracts time of POSIXct class objects in hours.</p> <p><img src="https://i.stack.imgur.com/ouqqe.png" alt="plot(p)"></p> <p>For <code>ggplot2-0.9.1</code>:</p> <pre><code>require("ggplot2") require("scales") dtstring &lt;- c( "2011-09-28 03:33:00", "2011-08-24 13:41:00", "2011-09-19 16:14:00", "2011-08-18 11:01:00", "2011-09-17 06:35:00", "2011-08-15 12:48:00" ) dtPOSIXct &lt;- as.POSIXct(dtstring) # extract time of 'date+time' (POSIXct) in hours as numeric dtTime &lt;- as.numeric(dtPOSIXct - trunc(dtPOSIXct, "days")) p &lt;- qplot(dtTime) + xlab("Time slot") + scale_x_datetime(labels = date_format("%S:00")) print(p) </code></pre> <p>For <code>ggplot2-0.9.3.1</code>:</p> <pre><code>require("ggplot2") require("scales") dtstring &lt;- c( "2011-09-28 03:33:00", "2011-08-24 13:41:00", "2011-09-19 16:14:00", "2011-08-18 11:01:00", "2011-09-17 06:35:00", "2011-08-15 12:48:00" ) dtPOSIXct &lt;- as.POSIXct(dtstring) # extract time of 'date+time' (POSIXct) in hours as numeric dtTime &lt;- as.numeric(dtPOSIXct - trunc(dtPOSIXct, "days")) class(dtTime) &lt;- "POSIXct" p &lt;- qplot(dtTime) + xlab("Time slot") + scale_x_datetime(labels = date_format("%S:00")) print(p) </code></pre>
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    1. POHow do I plot only the time portion of a timestamp including a date?
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    1. USTriad sou.
    1. USTriad sou.
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    1. POHow do I plot only the time portion of a timestamp including a date?
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    1. COThanks, I haven't used trunc that much. There's always something new to learn!
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      1. USWilliam Gunn
    2. COI'm confused about something. I'm working with a similar situation albeit with just over 2 million observations. When I use **format = "%S:00"**, I just get 00:00 for all X axis labels. I tried changing to **%H** (S = seconds and H = hours for this function), and that's not right, either: the X axis starts at 17:00, counts up to 0:00 then back to 18:00 at the end. (The labels are evenly spaced over that 25 hour span.)
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      1. USAren Cambre
    3. COHmm, I wonder if this has something to do with that I am in CDT, which is 5 hours behind GMT, and POSIX time starts counting from midnight GMT, Jan. 1, 1970? So if I add 5 * 60 * 60 to each value... No, scratch that. I am in CST right now, which is GMT-6.
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