Three dates can belong to one page
A newspaper page can carry an issue date, describe an earlier event and appear in a digital collection created much later. Copying the first visible date into an event timeline can collapse all three. An anniversary feature is an obvious example; a reprinted dispatch can be less obvious.
In an invented example, a May 10 issue might describe a ship arriving on May 7. The event belongs on May 7 if that is what the report establishes. May 10 remains the date of the printed report. The digitization date answers a different question again.
Search the issue and read the image
The Library of Congress's Chronicling America search guide distinguishes newspaper titles, issues and full-text pages. It explains date and location filters, alternative spellings and proximity searches. It also shows how optical character recognition can distort names, making a literal keyword search miss relevant pages.
A search result is therefore a lead to a page, not a substitute for reading it. Preserve the title, issue date, page and stable item address so another reader can find the same report.
Sources: s1
Contemporary does not mean complete
The National Archives emphasizes that primary documents carry points of view and require interpretation. A report printed near an event can still be partial or mistaken. Compare later corrections and other evidence before writing a definitive account. When reports conflict, show the dates and disagreement instead of silently choosing the account with the clearest headline. The resulting timeline may be less tidy, but its uncertainty is visible.
Sources: s2