diff --git a/erpnext/patches.txt b/erpnext/patches.txt
index 361fe83..e17e949 100644
--- a/erpnext/patches.txt
+++ b/erpnext/patches.txt
@@ -721,3 +721,4 @@
 erpnext.patches.v13_0.stock_entry_enhancements
 erpnext.patches.v12_0.update_state_code_for_daman_and_diu
 erpnext.patches.v12_0.rename_lost_reason_detail
+erpnext.patches.v13_0.update_start_end_date_for_old_shift_assignment
diff --git a/erpnext/patches/v13_0/update_start_end_date_for_old_shift_assignment.py b/erpnext/patches/v13_0/update_start_end_date_for_old_shift_assignment.py
new file mode 100644
index 0000000..e9dafd4
--- /dev/null
+++ b/erpnext/patches/v13_0/update_start_end_date_for_old_shift_assignment.py
@@ -0,0 +1,10 @@
+# Copyright (c) 2019, Frappe and Contributors
+# License: GNU General Public License v3. See license.txt
+
+from __future__ import unicode_literals
+
+import frappe
+
+def execute():
+    frappe.reload_doc('hr', 'doctype', 'shift_assignment')
+    frappe.db.sql("update `tabShift Assignment` set end_date=date, start_date=date, status='Inactive'  where date IS NOT NULL and start_date IS NULL and end_date IS NULL;")
\ No newline at end of file