Issue #18200: Update the stdlib (except tests) to use
ModuleNotFoundError.
diff --git a/Lib/datetime.py b/Lib/datetime.py
index bc1486c..2883418 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -2116,7 +2116,7 @@
 
 try:
     from _datetime import *
-except ImportError:
+except ModuleNotFoundError:
     pass
 else:
     # Clean up unused names