title: Storing integer as string in firebase realtime databse
body: <p>Is there anyway to store a date string 1/1/2017 as a key in a node in <code>firebase realtime database</code>? </p>
  
  <p>It create nested nodes with keys like 1->1->2->0->1->7. What i want is 1_1_2017->(Other data nodes)</p>