"datelines" in the noun sense
1. dateline, date line, International Date Line
an imaginary line on the surface of the earth following (approximately) the 180th meridian
a line at the beginning of a news article giving the date and place of origin of the news dispatch
"datelines" in the verb sense
1. dateline, datemark, date-mark
mark with a date and place
"dateline a newspaper article"
Source: WordNet® (An amazing lexical database of English)
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