title: R as.POSIXct() dropping hours minutes and seconds
body: <p>I am experimenting with R to analyse some measurement data. I have a .csv file containing more than 2 million lines of measurement. Here is an example:</p>
  
  <pre><code>2014-10-22 21:07:03+00:00,7432442.0
  2014-10-22 21:07:21+00:00,7432443.0
  2014-10-22 21:07:39+00:00,7432444.0
  2014-10-22 21:07:57+00:00,7432445.0
  2014-10-22 21:08:15+00:00,7432446.0
  2014-10-22 21:08:33+00:00,7432447.0
  2014-10-22 21:08:52+00:00,7432448.0
  2014-10-22 21:09:10+00:00,7432449.0
  2014-10-22 21:09:28+00:00,7432450.0
  </code></pre>
  
  <p>After reading in the file, I want to convert the time to a correct time, using <code>as.POSIXct()</code>. For small files this works fine, but for large files it does not.</p>
  
  <p>I made an example by reading in a big file, creating a copy of a small portion and then unleashing the <code>as.POSIXct()</code> on the correct column. I included an image of the file. As you can see, when applying it to the <code>temp</code>-variable it does correctl keep the hours, minutes and seconds. However, when applying it to the whole file, only the date is stored. (it also takes a LOT of time (more than 2 minutes))</p>
  
  <p><img src="https://i.stack.imgur.com/Hm85U.png" alt="POSIXct() error"></p>
  
  <p>What could cause this anomality? Is it due to some system limits, since I'm running this on my laptop.</p>
  
  <p><strong>Edit</strong></p>
  
  <p>On my Windows 7 device I run R 3.1.3 which results in this error. However, on Ubuntu 14.01, running R 3.0.2, the times are kept for the large files. Just noticed there is a newer version (3.2.0) for Windows, will update and check if the issue persists.</p>