When should you update a blog’s publication date?

Keep the original publication date and show a revision date when the content changes meaningfully. Dates help readers judge relevance; changing a timestamp alone does not make an old answer more useful.

Apply the idea

• Check the facts most likely to expire, such as prices, interfaces, and availability.
• Describe significant corrections when they affect a previous conclusion.
• Keep visible dates and Article metadata consistent.
• Retain the evidence behind a dated example rather than presenting it as a current observation.

A tutorial revised for a changed interface deserves a new modification date. A spelling correction usually does not need a “new guide” announcement. The distinction is whether the reader receives substantively different information.