title: Query MongoDb for a datetime value less than NOW
body: <p><a href="https://stackoverflow.com/questions/23405220/mongodb-c-sharp-query-for-timestamp-less-than-the-current-time">This</a> question addressess generating a query from C#, but how does one generate a comparision value equivalent to GetDate() (SQL Server) in MongoDB</p>
  
  <p>i.e. I would like to express a JSON query like this:</p>
  
  <pre><code>{
  Expiration: {$lte:  Now())},
  }
  </code></pre>