title: Linux date: invalid date
body: <p>Can someone explain this?  It returns "invalid date" only if the time is at 1 or 2.  After 3am it does do the conversion to unix time stamp. </p>
  
  <pre><code>[user@localhost ~]$ date --version
  date (GNU coreutils) 8.4
  Copyright (C) 2010 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later &lt;http://gnu.org/licenses/gpl.html&gt;.
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  
  Written by David MacKenzie.
  
  [user@localhost ~]$ date --date="Sun Mar 10 01:59:00 PDT 2013" +%s
  date: invalid date `Sun Mar 10 01:59:00 PDT 2013'
  
  [user@localhost ~]$ date --date="Sun Mar 10 02:59:00 PDT 2013" +%s
  date: invalid date `Sun Mar 10 02:59:00 PDT 2013'
  
  [user@localhost ~]$ date --date="Sun Mar 10 03:59:00 PDT 2013" +%s
  1362913140
  
  [user@localhost ~]$ date --date="Sun Mar 10 04:59:00 PDT 2013" +%s
  1362916740
  </code></pre>
  
  <p>Thanks!</p>