1880, imaginary line down the Pacific Ocean on which the calendar day begins and ends, from date (n.1) + line (n.). Meaning "line of text that tells the date and place of origin of a newspaper, article, telegram, etc." is from 1888.
实用例句
1. Then I saw the dateline -- 1924. The letter had been written almost sixty years earlier.
信的落款日期是1924年, 差不多写于60年前.来自互联网
2. The stories of newsmen on the scene have been wrapped up under a Paris dateline.
