erpnext/templates/includes/projects/timeline.html

{% for timeline in doc.timelines %}
	<article class="timeline-entry">
		<div class="timeline-entry-inner">
			<div class="timeline-icon {{ "bg-danger" if ((timeline.reference_name).startswith('ISS') and (timeline.subject).startswith('Open')) else "bg-warning" if ((timeline.reference_name).startswith('TASK') and (timeline.subject).startswith('Open')) else "bg-success" if (timeline.subject).startswith('Closed') else "bg-info"}}">		
			</div>
			<div class="timeline-label">
				<span class="avatar avatar-small" title="{{ timeline.modified_by }}"> <img src="{{ timeline.user_image }}"></span>
				<span class='indicator'>
				{{timeline.reference_name}} {{timeline.subject }}
				</span>
				<span class='indicator pull-right'>
				{{ frappe.utils.pretty_date(timeline.creation) }}
				</span>
			</div>
		</div>
	</article>
{% endfor %}