title: Realm maximumDate() method cannot resolve symbol
body: <p>I'm trying to pull out an object of <code>RealmCountyEntity</code> with the most recent <code>timestamp</code>. However for the parameter of <code>maximumdate</code>, I get an error that it cannot resolve the symbol. Within the <code>RealmCountyEntity</code> object there is a <code>timestamp</code> variable. I think I am confused as to exactly what this method requires. According to the documentation its the field within the object where this looks, but these don't seem to be matching up. Here is my realm call:</p>
  
  <pre><code>RealmCountyEntity myCounty = realm.where(RealmCountyEntity.class).maximumDate(timestamp);
  </code></pre>
  
  <p>Here is the <code>RealmCountyEntity</code> object code (I removed the irrelevant getters and setters of other fields to make it more clear. Otherwise all other code is intact):</p>
  
  <pre><code>package com.example.claire.pullstuff.Entity;
  
  
  import java.util.Date;
  
  import io.realm.RealmObject;
  
  public class RealmCountyEntity extends RealmObject {
  
      private Date timestamp;
  
      //getters and setters
      public void setTimestamp(Date t){
          timestamp = t;
      }
  
      public Date getTimestamp(){
          return timestamp;
      }
  
  }
  </code></pre>
  
  <p>I'd greatly appreciate any insight in this. Thank you!</p>