{{ event.start_day }} 
{% if event.start_time %} {% if not event.end_day %}{% if event.end_time %}de{% else %}à{% endif %}{% endif %}
    {{ event.start_time }}
{% endif %}
{% if event.end_day %}
    au {% if event.end_day %}{{ event.end_day }}{% endif %}
{% endif %}
{% if event.end_time %} {% if not event.end_day %}jusqu'à{% endif %} {{ event.end_time }}{% endif %}