Seeing as I do a lot of AV editing I use this format to keep track of Audio files I do production on. YYYYMMDD Filename Version. It's often a case of working on a file and coming back to it weeks or months later, and in most cases there are multiple versions and revisions as I collaborate with my production partner.

It helps me keep track of the timeframe, what it is and which version so I can ensure rendered versions I'm using in other directories or as assets in other files are consistent and up to date.

The directories got quite messy and confusing initially until I adopted the ISO date format for this case.