feat: add initial support for positioning

Signed-off-by: Konstantin Fickel <mail@konstantinfickel.de>

src/streamer/localize/extract_datetime.py

@@ -0,0 +1,21 @@
+from datetime import datetime
+import re
+import os
+from typing import Optional
+
+
+def extract_date_from_file_name(file_name: str) -> Optional[datetime]:
+    FILE_NAME_REGEX = r"^(?P<date>\d{8})(?:-(?P<time>\d{4,6}))?.+.md$"
+    base_name = os.path.basename(file_name)
+    match = re.match(FILE_NAME_REGEX, base_name)
+
+    if match:
+        date_str = match.group("date")
+        time_str = match.group("time") or ""
+        time_str = time_str.ljust(6, "0")
+        datetime_str = f"{date_str} {time_str[:2]}:{time_str[2:4]}:{time_str[4:]}"
+        return datetime.strptime(datetime_str, "%Y%m%d %H:%M:%S")
+    return None
+
+
+__all__ = ["extract_date_from_file_name"]