diff --git a/account_bank_statement_import_online/models/online_bank_statement_provider.py b/account_bank_statement_import_online/models/online_bank_statement_provider.py
index 72fa2d47..0858618d 100644
--- a/account_bank_statement_import_online/models/online_bank_statement_provider.py
+++ b/account_bank_statement_import_online/models/online_bank_statement_provider.py
@@ -248,6 +248,8 @@ class OnlineBankStatementProvider(models.Model):
                 for line_values in lines_data:
                     date = line_values['date']
                     if not isinstance(date, datetime):
+                        if not isinstance(date, str):
+                            date = fields.Datetime.to_string(date)
                         date = fields.Datetime.from_string(date)
 
                     if date.tzinfo is None:
diff --git a/account_bank_statement_import_online/tests/test_account_bank_statement_import_online.py b/account_bank_statement_import_online/tests/test_account_bank_statement_import_online.py
index 048da677..78d830aa 100644
--- a/account_bank_statement_import_online/tests/test_account_bank_statement_import_online.py
+++ b/account_bank_statement_import_online/tests/test_account_bank_statement_import_online.py
@@ -574,7 +574,7 @@ class TestAccountBankAccountStatementImportOnline(common.TransactionCase):
         self.assertEqual(lines[2].date, '2020-04-18')
         self.assertEqual(lines[3].date, '2020-04-18')
 
-    def test_timestamp_date_only(self):
+    def test_timestamp_date_only_date(self):
         journal = self.AccountJournal.create({
             'name': 'Bank',
             'type': 'bank',
@@ -599,13 +599,11 @@ class TestAccountBankAccountStatementImportOnline(common.TransactionCase):
         self.assertEqual(len(statement), 1)
 
         lines = statement.line_ids
-        self.assertEqual(len(lines), 4)
-        self.assertEqual(lines[0].date, '2020-04-18')
-        self.assertEqual(lines[1].date, '2020-04-18')
-        self.assertEqual(lines[2].date, '2020-04-18')
-        self.assertEqual(lines[3].date, '2020-04-18')
+        self.assertEqual(len(lines), 24)
+        for line in lines:
+            self.assertEqual(line.date, '2020-04-18')
 
-    def test_timestamp_date_only(self):
+    def test_timestamp_date_only_str(self):
         journal = self.AccountJournal.create({
             'name': 'Bank',
             'type': 'bank',