Logs are getting auto deleted after the date is changed.

Bug report

Bug description:

I have written a code that would rotate logs on midnight maintaing backup of 1 day. But the next day, the previous logs are getting deleted.

For example :
While I am checking logs on 14th Feb, I noticed that all the logs generated on 13th Feb, got deleted from instancelogs.log.2025-02-13. The first log generated on 14th Feb is getting stored in instancelogs.log.2025-02-13 file instead of instancelogs.log file , the remaining logs for 14th Feb are correctly stored in instancelogs.log file.

Please look into the issue as we are losing all the logs for 13th of Feb.

I am using below code to handle logs:

import logging
from logging.handlers import TimedRotatingFileHandler


#logger instances for PPT creator
LOG_FILE_PATH = "../STORE_LOGS/instancelogs.log"

instance_logger = logging.getLogger('instance_logger')

instance_logger_file_handler = None


instance_logger_file_handler = TimedRotatingFileHandler(LOG_FILE_PATH, when='midnight', interval=1, backupCount=1)
instance_logger_file_formatter = logging.Formatter(
    fmt="[%(asctime)s] - [%(levelname)s]  - [%(filename)s] - [%(funcName)s] - %(message)s",
    datefmt="%d-%m-%y %H:%M:%S")
instance_logger_file_handler.setFormatter(instance_logger_file_formatter)

instance_logger.setLevel(logging.DEBUG)
instance_logger.addHandler(instance_logger_file_handler)

CPython versions tested on:

3.9

Operating systems tested on:

Linux

Commencez par l’implémentation de Python logging.handlers.TimedRotatingFileHandler et son comportement de rollover, en utilisant la configuration de minuit fournie comme cas de reproduction. Vérifiez comment le premier enregistrement après minuit est affecté au nom de fichier ayant fait l’objet de la rotation et comment backupCount=1 supprime les fichiers. Le travail est considéré comme terminé lorsque les logs du jour précédent restent intacts et que les enregistrements du nouveau jour sont écrits dans le fichier de log actif, avec une couverture de régression pour ce cas.