Alternative stricter fix: explicit isoformat(" "),

I think we need to avoid registering a default adapter, especially if
CPython want to remove them.

So we are going to call .isoformat(" ") explicitly. For backward compat
we'll keep the delimiter as " ", but we might want to consider using the
default of T later on, but still keeping in mind that old history have a
space.

IPython/core/history.py

@@ -9,7 +9,6 b' import datetime'
 from pathlib import Path
 import re
 import sqlite3
-import sys
 import threading
 
 from traitlets.config.configurable import LoggingConfigurable
@@ -30,14 +29,6 b' from traitlets import ('
     observe,
 )
 
-
-if sys.version_info >= (3, 12):
-
-    def _adapt_datetime(val):
-        return val.isoformat(" ")
-
-    sqlite3.register_adapter(datetime.datetime, _adapt_datetime)
-
 #-----------------------------------------------------------------------------
 # Classes and functions
 #-----------------------------------------------------------------------------
@@ -583,7 +574,7 b' class HistoryManager(HistoryAccessor):'
             cur = conn.execute(
                 """INSERT INTO sessions VALUES (NULL, ?, NULL,
                             NULL, '') """,
-                (datetime.datetime.now(),),
+                (datetime.datetime.now().isoformat(" "),),
             )
             self.session_number = cur.lastrowid
 
@@ -591,9 +582,15 b' class HistoryManager(HistoryAccessor):'
         """Close the database session, filling in the end time and line count."""
         self.writeout_cache()
         with self.db:
-            self.db.execute("""UPDATE sessions SET end=?, num_cmds=? WHERE
-                            session==?""", (datetime.datetime.now(),
-                            len(self.input_hist_parsed)-1, self.session_number))
+            self.db.execute(
+                """UPDATE sessions SET end=?, num_cmds=? WHERE
+                            session==?""",
+                (
+                    datetime.datetime.now().isoformat(" "),
+                    len(self.input_hist_parsed) - 1,
+                    self.session_number,
+                ),
+            )
         self.session_number = 0
 
     def name_session(self, name):

IPython/core/logger.py

@@ -20,7 +20,6 b' import os'
 import time
 
 
-
 # prevent jedi/parso's debug messages pipe into interactiveshell
 logging.getLogger("parso").setLevel(logging.WARNING)