Look at the derpfest github bro, they have names for the versions.How do people supposed to know which one is which one? There is going to be different versions of your rom after all. Some with some bugs or with new features. People might want to go back to previous version or install a specific version. Numbering your versions would be a good idea. It's up to you though.
And npv writes the date, take simply the date as version.
Why people always want more as they have