ansible/test/integration/targets/timezone/tasks/main.yml

- name: Set timezone to Etc/UTC
  timezone:
    name: Etc/UTC
  register: original_timezone

- block:
    - name: Set timezone to Australia/Brisbane
      timezone:
        name: Australia/Brisbane
      register: timezone_set

    - name: Ensure timezone changed
      assert:
        that:
          - timezone_set is changed
          - timezone_set.diff.after.name == 'Australia/Brisbane'
          - timezone_set.diff.before.name == 'Etc/UTC'
  always:
    - name: Restore original system timezone - {{ original_timezone.diff.before.name }}
      timezone:
        name: "{{ original_timezone.diff.before.name }}"