refactor: remove @staticmethod from _parse_start_date, use self.DATE_TIME_FORMAT

Co-Authored-By: Daryna Ishchenko <darina.ishchenko17@gmail.com>

Author: devin-ai-integration[bot]

airbyte_cdk/sources/file_based/file_based_stream_reader.py

@@ -98,11 +98,10 @@ def get_matching_files(
         """
         ...
 
-    @staticmethod
-    def _parse_start_date(start_date_str: str) -> datetime:
+    def _parse_start_date(self, start_date_str: str) -> datetime:
         """Parse a start_date string, supporting both with and without microseconds."""
         try:
-            return datetime.strptime(start_date_str, AbstractFileBasedStreamReader.DATE_TIME_FORMAT)
+            return datetime.strptime(start_date_str, self.DATE_TIME_FORMAT)
         except ValueError:
             return datetime.strptime(start_date_str, "%Y-%m-%dT%H:%M:%SZ")