diff --git a/erpnext/buying/doctype/purchase_order/purchase_order.py b/erpnext/buying/doctype/purchase_order/purchase_order.py
index ba928c6dbb7..e25332528e2 100644
--- a/erpnext/buying/doctype/purchase_order/purchase_order.py
+++ b/erpnext/buying/doctype/purchase_order/purchase_order.py
@@ -406,11 +406,10 @@ class PurchaseOrder(BuyingController):
 			update_bin_qty(item_code, warehouse, {"ordered_qty": get_ordered_qty(item_code, warehouse)})
 
 	def check_modified_date(self):
-		mod_db = frappe.db.sql("select modified from `tabPurchase Order` where name = %s", self.name)
-		date_diff = frappe.db.sql(f"select '{mod_db[0][0]}' - '{cstr(self.modified)}' ")
+		modified_in_db = frappe.db.get_value("Purchase Order", self.name, "modified")
 
-		if date_diff and date_diff[0][0]:
-			msgprint(
+		if modified_in_db and cstr(modified_in_db) != cstr(self.modified):
+			frappe.msgprint(
 				_("{0} {1} has been modified. Please refresh.").format(self.doctype, self.name),
 				raise_exception=True,
 			)