That only makes sense for users who are programmers. Non-technical users have got no idea what you're talking about. All they see is the UI and the presented feature sets.
LibreOffice 2012-1 is the first release in 2012, 2012-2 is the second release, 2013-1 is the first in 2013, etc.
Depending on release schedule, the second number can be the month (like Ubuntu) or dropped altogether.
Having said that, LibreOffice seriously needs a more seamless update experience for consumers. Re-downloading a 100MB installer and re-installing every time a minor update is published gets tired rather quickly.
Windows 7
Windows 8
iPhone 3
iPhone 3GS (minor update)
etc.