gh-99811: Use correct variable to search for time in format string (GH-99812)

Use correct variable to search for asctime

Lib/logging/__init__.py

diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index 86e1efe..9241d73 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -511,7 +511,7 @@ def __init__(self, *args, **kwargs):
 
     def usesTime(self):
         fmt = self._fmt
-        return fmt.find('$asctime') >= 0 or fmt.find(self.asctime_format) >= 0
+        return fmt.find('$asctime') >= 0 or fmt.find(self.asctime_search) >= 0
 
     def validate(self):
         pattern = Template.pattern