Finding mysterious Django variables in templates

finding_variables.md

In a Django template file...

{% if last_updated %}Last Updated: {{ last_updated }}{% endif %}
{% endblock %}

Wait, where is last updated set?

$ grep -R "last_updated" .        	// where "." is the Django project directory

stuff
./editorial/admin.py:			last_updated = datetime.datetime.now().strftime('%B %d, %Y %I:%M %p %z')
stuff

Aha!