Update salary_structure.py
diff --git a/erpnext/hr/doctype/salary_structure/salary_structure.py b/erpnext/hr/doctype/salary_structure/salary_structure.py
index 828962e..b9f246a 100644
--- a/erpnext/hr/doctype/salary_structure/salary_structure.py
+++ b/erpnext/hr/doctype/salary_structure/salary_structure.py
@@ -4,7 +4,7 @@
 from __future__ import unicode_literals
 import frappe
 
-from frappe.utils import flt, cint
+from frappe.utils import flt, cint, getdate
 from frappe import _
 from frappe.model.mapper import get_mapped_doc
 from frappe.model.document import Document