We found 3 dictionaries that define the word date lines:

General (3 matching dictionaries)

1. date lines: Merriam-Webster
2. date lines: Collins English Dictionary
3. date lines: Vocabulary.com

(Note: See date_line as well.)

Definitions from Wiktionary (Date Line) ▸ noun:  synonym of International Date Line ▸ Also see date_line ▸ Words similar to date lines ▸ Usage examples for date lines ▸ Idioms related to date lines ▸ Wikipedia articles (New!) ▸ Words that often appear near date lines ▸ Rhymes of date lines ▸ Invented words related to date lines