MySQL Backup create destination strftime request

It would be nice to have strftime functionality for directory name creating for MySQL backups as this is a handy feature and already works great for virtual hosts backups :)

Example:

Webmin MySQL Database Server module.

Backup Databases feature.

When backing up to a directory such as:
/back_up/Daily_DB_%Y%m%d

and create custom directory is selected the directory created is:

/back_up/Daily_DB_%Y%m%d

rather than the preferred:
/back_up/Daily_DB_20080628