Often dates are extremely relevant, for example a 10 year old hardware review won't be as relevant as a new one. On the other hand, blogs don:t have to be static, some programing technique might still be relevant, but need to be updated for a new version of the language.
Solution: put a "first published" and a "last updated" date, or use a wiki that makes the revisions available online and a way to link to the different revisions.
A variant of that, but something I’d like to see is listing initial publication and current revision/update status (including initial). Then at the bottom of the post put a summary of each update so readers know how the post has evolved.
Solution: put a "first published" and a "last updated" date, or use a wiki that makes the revisions available online and a way to link to the different revisions.