docs: def set_timezone(rollback=False):
      """
      Set the time zone on the server using Django settings.TIME_ZONE
      """
      if not rollback:
          if contains(filename='/etc/timezone', text=env.TIME_ZONE, use_sudo=True):
              return False
          if env.verbosity:
              print env.host, "CHANGING TIMEZONE /etc/timezone to "+env.TIME_ZONE
          _backup_file('/etc/timezone')
          sudo('echo %s > /tmp/timezone'% env.TIME_ZONE)
          sudo('cp -f /tmp/timezone /etc/timezone')
          sudo('dpkg-reconfigure --frontend noninteractive tzdata')
      else:
          _restore_fie('/etc/timezone')
          sudo('dpkg-reconfigure --frontend noninteractive tzdata')
      return True