diff --git a/src/sphinx_timeline/dtime.py b/src/sphinx_timeline/dtime.py
index 438e930..12570ee 100644
--- a/src/sphinx_timeline/dtime.py
+++ b/src/sphinx_timeline/dtime.py
@@ -1,4 +1,5 @@
 """Utilities for parsing and formatting dates and times."""
+
 from __future__ import annotations
 
 from datetime import date, datetime, time, timezone