Start with the article’s visible byline and look for labels such as Published or Updated. If the date is missing, source code and archived copies can provide clues. None of those clues should be silently treated as an exact original publication date when the evidence is incomplete.
Check what the visible date actually describes
A news event date, a copyright year in the footer and the day a search engine visited a page are not necessarily the article’s publication date. Look near the title, author and end of the text, and distinguish an original date from a revision date.
| Evidence | What it can tell you | Main limitation |
|---|---|---|
| Published label | The publisher’s stated publication date. | The publisher may have migrated or changed the record. |
| Updated label | The stated revision date. | It does not identify the original date. |
| Structured data | Machine-readable publication or modification fields. | These are publisher-supplied claims too. |
| An archived capture | The page existed by that capture time. | The first available capture may be later than publication. |
Inspect the page’s source
Open View page source in a desktop browser and search for datePublished, dateModified or article:published_time. Our HTML source-viewing guide explains how to reach the source in different browsers.
Google’s Article structured-data documentation distinguishes publication and modification fields. If there are several dates, check which article or object each one belongs to. A sidebar’s date or another article’s data can be present in the same page.
Compare independent clues
Search for the exact title and publisher, inspect an official RSS feed if available, and check an archived version of the same URL. An early capture gives an upper bound: the page was online by then. The absence of an earlier capture does not prove it did not exist.
A search-result date is another clue, not a certificate. Google’s publication-date guidance explains how publishers present date information to Search. Search engines can choose among signals and can update the date they display.
Report uncertainty clearly
If the byline says Published May 3 and Updated June 10, record both with their labels. If you only have a June 10 archive capture, say the page was available by June 10. Do not call that the first publication day.
The HTTP Last-Modified header, when present, describes a server’s modification information and can change after a rebuild or migration. For an exact date needed for research or a dispute, ask the publisher for its original record rather than relying on a URL pattern or a browser extension’s guess.
Frequently asked questions
Is Last-Modified the original publication date?
No. It is server-provided modification information and can change for reasons unrelated to the first publication.
Does the first archive capture prove the publication day?
No. It proves availability by that capture time; the article may have existed earlier.
What if datePublished and dateModified differ?
They usually describe different events: first publication and a later modification. Record both with their labels.
Can every page be dated exactly?
No. If reliable records are missing or conflicting, state the uncertainty or ask the publisher.