Adding Calendar view for Opportunity

erpnext/crm/doctype/opportunity/opportunity.py

@@ -336,3 +336,27 @@ def make_opportunity_from_communication(communication, ignore_communication_link
 	link_communication_to_document(doc, "Opportunity", opportunity.name, ignore_communication_links)
 
 	return opportunity.name
+@frappe.whitelist()
+def get_events(start, end, filters=None):
+	"""Returns events for Gantt / Calendar view rendering.
+	:param start: Start date-time.
+	:param end: End date-time.
+	:param filters: Filters (JSON).
+	"""
+	from frappe.desk.calendar import get_event_conditions
+	conditions = get_event_conditions("Opportunity", filters)
+
+	data = frappe.db.sql("""
+		select
+			distinct `tabOpportunity`.name, `tabOpportunity`.customer_name, `tabOpportunity`.opportunity_amount,
+			`tabOpportunity`.title, `tabOpportunity`.contact_date
+		from
+			`tabOpportunity`
+		where
+			(`tabOpportunity`.contact_date between %(start)s and %(end)s)
+			{conditions}
+		""".format(conditions=conditions), {
+			"start": start,
+			"end": end
+		}, as_dict=True, update={"allDay": 0})
+	return data

erpnext/crm/doctype/opportunity/opportunity_calendar.js

@@ -7,6 +7,13 @@ frappe.views.calendar["Opportunity"] = {
 		"id": "name",
 		"title": "customer_name",
 		"allDay": "allDay"
-	},
+    },
-    get_events_method: 'frappe.desk.doctype.event.event.get_events'
+	options: {
+		header: {
+			left: 'prev,next today',
+			center: 'title',
+			right: 'month'
+		}
+    },
+    get_events_method: 'erpnext.crm.doctype.opportunity.opportunity.get_events'
 }