--- the defaults.yaml
{% load_yaml as rawmap %}
Debian:
  common:
    timezone:
      managed: True      # Set to False to ignore this "module"
      name: "Europe/Berlin"
      utc: True
{% endload %}

--- the SLS
#!jinja|yaml
#
# Copy of https://github.com/bechtoldt/saltstack-time-formula/blob/master/time/init.sls
#

{% from "common/defaults.yaml" import rawmap with context %}
{% set datamap = salt['grains.filter_by'](rawmap, merge=salt['pillar.get']('common:lookup')) %}

{% if datamap.timezone.managed %}
systimezone:
  timezone:
    - system
    - name: {{ datamap.timezone.name }}
    - utc: {{ datamap.timezone.utc }}
{% endif %}

--- the error:
saltmaster.pcdummy.lan:
    Data failed to compile:
----------
    Rendering SLS 'base:common.timezone' failed: Jinja variable 'dict object' has no attribute 'timezone'