How do I change the folder name that is automatically generated when backing up

Hello, during the backup, the system will automatically generate two folders (one folder name is the name of the client host and the other one is the folder generated according to the date). Now we need to change the specific time of the folder generated according to the date into only the year, month and day.

Could you please change the time folder automatically created to your date

May I ask if the time folder created automatically can be changed to only year, month and day (sorry English is not my main language)?