title: RTF date stamp converted to a DateTime format and vice versa in .NET
body: <p>Does anyone know in which datetime format is represented the date stamp in the RTF? </p>
  
  <p>For example: 
  If you have a comment in a Word document dated from "1970-01-01T00:00:00" and you export the document in rich text formatted document, the DateTime above will be parsed as: "-2074015744". </p>
  
  <p>If the date in the RTF was represented in UNIX time it should be "0000000000", so I think that this is not the right format.</p>
  
  <p>To be more concrete: Let's say we have the following part of a RTF doc:</p>
  
  <pre><code>{\*\atrfstart 37360238}{\*\atrfend 37360238}{\*\atnid JD}{\*\atnauthor John Doe}\chatn{\*\annotation{\*\atnref 37360238}{\*\atndate 1730446516}\pard\s0\ltrpar\sl276\slmult1{\ltrch\i0\b0\strike0\ulnone sample comment}{\ltrch\i0\b0\strike0\ulnone\par}}
  </code></pre>
  
  <p>the date of the annotation is represented by {*\atndate 1730446516} group. We want to parse the integer which is preceded by the control word \atndate in DateTime format.</p>
  
  <p>Thanks in advance!</p>