title: Searching unformatted dates
body: <p>I have a list of transaction data that I am providing a search input for so that the user can view specific transaction types and dates. In the raw JSON data that the ng-repeat consumes, the transaction <code>date</code> field is a unix timestamp.</p>
  
  <p>For display purposes, the timestamp is passed through a custom date formatting filter that converts it to a human readable format.</p>
  
  <pre><code>{{item.date | formatDate}}
  </code></pre>
  
  <p>Now, in the search input, the terms entered are looking at the pre-filtered data, rather than the post-filtered data (i.e. searching for March 31 fails, but searching for the timestamp works as expected).</p>
  
  <p>Other than creating a new <code>dateFormatted</code> field in the source JSON, is there any way to instruct the search filtering to look at post-filtered data? Any other solutions?</p>
  
  <p>Thanks!</p>