This format looks good. But I think we should leave other for too for compatibility. Something like this:

```obj-c
typedef enum {
    // Application name followed by date.
    // Example: MobileSafari 2013-12-03 17-14.log
    DDLogFileNamingConventionDefault,

    // old file naming convetion, using UUID.
    // Example: log-DFFE99.txt
    DDLogFileNamingConventionUUID,

    // old file naming convention, using UTC time in RFC 3339 format.
    // Example: log-2013-12-20T15-20-30Z.txt
    DDLogFileNamingConventionTimestamp
} DDLogFileNamingConvention;
```