title: Auto populate timestamp in DynamoDB
body: <p>I come from Relational Database background and we have a way to populate timestamp for row creation and update. 
  I am having difficulty finding similar feature for DynamoDB. </p>
  
  <p>I checked DynamoDB to check if they support autopopulate the date timestamp for every entry in dynamoDB. I see it is possible to create random ID but that is not what I need. </p>
  
  <p>My usecase is to add a timestamp entry automatically when I add any entry to DynamoDB Table. Appreciate any pointers. Thanks</p>