title: 'ansible_date_time' is undefined
body: <p>Trying to register an ec2 instance in AWS with Ansible's ec2_ami module, and using current date/time as version (we'll end up making a lot of AMIs in the future).</p>
  
  <p>This is what I have:</p>
  
  <pre><code>- name: Create new AMI
    hosts: localhost
    connection: local
    gather_facts: false
    vars:
    tasks:
      - include_vars: ami_vars.yml
      - debug: var=ansible_date_time
      - name: Register ec2 instance as AMI
        ec2_ami: aws_access_key={{ ec2_access_key }}
                 aws_secret_key={{ ec2_secret_key }}
                 instance_id={{ temp_instance.instance_ids[0] }}
                 region={{ region }}
                 wait=yes
                 name={{ ami_name }}
        with_items: temp_instance
        register: new_ami
  </code></pre>
  
  <p>From ami_vars.yml:</p>
  
  <pre><code>ami_version: "{{ ansible_date_time.iso8601 }}"
  ami_name: ami_test_{{ ami_version }}
  </code></pre>
  
  <p>When I run the full playbook, I get this error message:</p>
  
  <pre><code>fatal: [localhost]: FAILED! =&gt; {"failed": true, "msg": "ERROR! ERROR! ERROR! 'ansible_date_time' is undefined"}
  </code></pre>
  
  <p>However, when run the debug command separately, from a separate playbook, it works fine:</p>
  
  <pre><code>- name: Test date-time lookup
    hosts: localhost
    connection: local
    tasks:
      - include_vars: ami_vars.yml
      - debug: msg="ami version is {{ ami_version }}"
      - debug: msg="ami name is {{ ami_name }}"
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>TASK [debug] *******************************************************************
  ok: [localhost] =&gt; {
      "msg": "ami version is 2016-02-05T19:32:24Z"
  }
  
  TASK [debug] *******************************************************************
  ok: [localhost] =&gt; {
      "msg": "ami name is ami_test_2016-02-05T19:32:24Z"
  }
  </code></pre>
  
  <p>Any idea what's going on?</p>