title: How to query between two dates in graphql
body: <p>I have a problem here regarding Realm queries in GraphQL.</p>
  
  <p>Is it possible to query between two dates in graphql?</p>
  
  <p>This is what I've tried:</p>
  
  <pre><code>query getStudents{
    student(query:"created_datime BETWEEN {'2018-02-24T14:59:43.842Z','2018-02-28T14:59:43.842Z'}"){
      id
      code
      name
      created_datetime
      modified_datetime
      status
    }
  }
  </code></pre>
  
  <p>it occurs an error "Invalid Predicate".</p>
  
  <p>How to query it correctly?</p>