new: basic arbtt module

my/core/__init__.py

@@ -4,6 +4,7 @@ from .common import get_files
 from .common import LazyLogger
 from .common import warn_if_empty
 from .common import stat, Stats
+from .common import datetime_naive, datetime_aware
 
 from .cfg import make_config
 from .util import __NOT_HPI_MODULE__

my/core/common.py

@@ -552,3 +552,7 @@ def to_jsons(it) -> Iterable[Json]:
             yield error_to_json(r)
         else:
             yield asdict(r)
+
+
+datetime_naive = datetime
+datetime_aware = datetime