gistfile1.yml

- name: Group by Distribution
  hosts: all
  tasks:
    - group_by: key=${ansible_distribution}

- name: Set Time Zone
  hosts: Ubuntu
  gather_facts: False
  tasks:
    - name: Set timezone variables
      copy: content='Europe/London'
            dest=/etc/timezone
            owner=root
            group=root
            mode=0644
            backup=yes
      notify:
        - update timezone
  handlers:
    - name: update timezone
      command: dpkg-reconfigure --frontend noninteractive tzdata

gistfile2.sh

vagrant@us:~$ ll /etc/ | grep timezone
-rw-r--r--  1 root root      20 May 16 06:27 timezone
-rw-r--r--  1 root root      20 May 16 06:22 timezone.2013-05-16@06:24~
-rw-r--r--  1 root root      20 May 16 06:24 timezone.2013-05-16@06:27~
vagrant@us:~$ cat /etc/timezone
America/Los_Angeles
vagrant@us:~$ cat /etc/timezone.2013-05-16@06:24~
America/Los_Angeles
vagrant@us:~$ cat /etc/timezone.2013-05-16@06:27~
America/Los_Angeles
vagrant@us:~$