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You can use the strftime format in the file name of the appender path, which will generate a file name with the current date and time. Here's an example YAML configuration file:

appenders:
  file:
    kind: file
    path: "logs/app_%Y-%m-%d.log"
    encoder:
      pattern: "{d} [{t}] {l} - {m}{n}"

root:
    level: debug
    appenders:
    - file

In this example, the %Y-%m-%d format in the file name will be replaced with the current date in the format YYYY-MM-DD.
So, when you run the application on October 31, 2021, the log file generated will be app_2021-10-31.log.

You can also include the current time in the file name by adding the %H-%M-%S format to the file name.