title: Git log before some commit date
body: <p>I'm trying to get all commits before some date from AOSP (android open source project).<br>
  I found that I can do it by git command:<br>
  <code>git log --before="2011-12-01"</code></p>
  
  <p>But it shows me only <code>author date</code> (date when patch or change was uploaded buy not merged/changed)</p>
  
  <p>Also I found that I  can get date which I need by next <code>git</code>  command:<br>
  <code>git log --pretty=format:"%cd"</code><br>
  I't will show <code>commit date</code>.  </p>
  
  <p>And the question is:<br>
  how can get git log before some <code>commit date</code>?</p>