title: Filter dates on a store in ExtJS
body: <p>I have a form with <strong>4</strong> datefields <strong>(creation date start, create date ent, updated date start and updated date end)</strong>.</p>
  
  <p>In the form bottom, i have a <strong>gridpanel</strong> with a <strong>column "Create Date"</strong> and <strong>other column "Updated Date"</strong>.</p>
  
  <p>I need to make a filter with the range of creation dates for column "create date" and another tolher to range for updated dates.</p>
  
  <p>How i can make this comparison? Any help? </p>