IPA: //ˈdeɪtlaɪn//
KK: /ˈdeɪtlaɪn/
A line in a newspaper or document that shows the date and location where it was written or published.
The article included a dateline that indicated it was written in New York on March 5th.
Dateline → It is formed from "date" (from Latin "data", meaning something given) and "line" (from Old English "līn", meaning a string or a row). The word "dateline" refers to a line that indicates the date of an event or news item.
Think of a 'line' that shows a 'date' — that's what a dateline is, marking when something happened.