fix parse

airbyte-cdk/python/airbyte_cdk/sources/declarative/stream_slicers/datetime_stream_slicer.py

@@ -174,10 +174,15 @@ def _get_date(self, cursor_value, default_date: datetime.datetime, comparator) -
         return comparator(cursor_date, default_date)
 
     def parse_date(self, date: Union[str, datetime.datetime]) -> datetime.datetime:
-        if isinstance(date, str):
-            return datetime.datetime.strptime(str(date), self.datetime_format).replace(tzinfo=self._timezone)
-        else:
+        if isinstance(date, datetime.datetime):
             return date
+        elif self.datetime_format == "%s":
+            # strftime("%s") is unreliable because it ignores the time zone information and assumes the time zone of the system it's running on
+            # It's safer to use the timestamp() method than the %s directive
+            # See https://stackoverflow.com/a/4974930
+            return datetime.datetime.fromtimestamp(int(date)).replace(tzinfo=self._timezone)
+        else:
+            return datetime.datetime.strptime(str(date), self.datetime_format).replace(tzinfo=self._timezone)
 
     @classmethod
     def _parse_timedelta(cls, time_str):

airbyte-cdk/python/unit_tests/sources/declarative/stream_slicers/test_datetime_stream_slicer.py

@@ -461,6 +461,12 @@ def test_request_option(test_name, inject_into, field_name, expected_req_params,
             "%Y%m%d",
             datetime.datetime(2021, 1, 1, 0, 0, tzinfo=datetime.timezone.utc),
         ),
+        (
+            "test_parse_timestamp",
+            "1609459200",
+            "%s",
+            datetime.datetime(2021, 1, 1, 0, 0, tzinfo=datetime.timezone.utc),
+        ),
     ],
 )
 def test_parse_date(test_name, input_date, date_format, expected_output_date):