diff --git a/frappe/public/js/frappe/data_import/import_preview.js b/frappe/public/js/frappe/data_import/import_preview.js
index 6c17cb4351..477cfb0786 100644
--- a/frappe/public/js/frappe/data_import/import_preview.js
+++ b/frappe/public/js/frappe/data_import/import_preview.js
@@ -101,6 +101,7 @@ frappe.data_import.ImportPreview = class ImportPreview {
 					.replace('%H', 'HH')
 					.replace('%M', 'mm')
 					.replace('%S', 'ss')
+					.replace('%b', 'Mon')
 				: null;
 
 			let column_title = `<span class="indicator green">
diff --git a/frappe/utils/data.py b/frappe/utils/data.py
index 41f247da45..cef4243913 100644
--- a/frappe/utils/data.py
+++ b/frappe/utils/data.py
@@ -1300,12 +1300,14 @@ def generate_hash(*args, **kwargs):
 
 def guess_date_format(date_string):
 	DATE_FORMATS = [
+		r"%d/%b/%y",
 		r"%d-%m-%Y",
 		r"%m-%d-%Y",
 		r"%Y-%m-%d",
 		r"%d-%m-%y",
 		r"%m-%d-%y",
 		r"%y-%m-%d",
+		r"%y-%b-%d",
 		r"%d/%m/%Y",
 		r"%m/%d/%Y",
 		r"%Y/%m/%d",