Don`t think there is a standard, but there may be inhouse standards built by your organisation or your own.
After 12 years in the business and going through different naming schemes, i found the most useful for me is to name drafts as numbers. Eg. 01, 02, 03, etc. There will be a separate folder with previews sent to the client at different stages and these will also be named 01, 02, 03, etc.
About the date, every one of these files has a system date assigned which is clearly visible via the file browser, so i will not bother to include a date in the filenames, although this is sometimes useful when sending out drafts to clients.
For projects developing over a longer period (a few months) i will reset this counter at some point and name the latest draft "01" and delete older drafts, especially if an intermediate milestone is agreed with the client.
Then when the job is finished and delivered, in most cases i will just keep the final editable (in most cases with no older versions) and i will also backup the final deliverables (jpgs, pdfs, etc).