diff --git a/aocp/aoc.py b/aocp/aoc.py
index de6099629aa8026050ff214c0c11bc01e57d7616..02244708b3d062147155271e71ccaa55ccb1dd0d 100755
--- a/aocp/aoc.py
+++ b/aocp/aoc.py
@@ -135,16 +135,18 @@ def init_app(app):
     """
     app.cli.add_command(test_aoc_py_command)
 
-def get_aoc_day(timestamp : datetime = datetime.now(tz=timezone.utc), year : int|None = None)-> Tuple[int, int]:
+def get_aoc_day(timestamp : datetime|None = None, year : int|None = None)-> Tuple[int, int]:
     """
     Returns a tuple:
     - The current AOC Day (1-25), or 0 if the event hasn't started yet, or 26 if the event is already over.
     - The hour (0-23) of the AOC Day of the timestamp.
 
     Parameters:
-    timestamp -- Overwrite the "current" timestamp. Must be timezone aware.
+    timestamp -- Overwrite the "current" timestamp. Must be timezone aware. If timestamp is None, the current time is used.
     year -- Overwrite the AOC year. If None the YEAR from the config is used.
     """
+    if timestamp is None:
+        timestamp = datetime.now(tz=timezone.utc)
     timestamp = timestamp.astimezone(ZoneInfo("EST")) # convert to EST time
     hour = timestamp.hour
     if year is None: