The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the other side.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). date line. Retrieved September 23, 2026, from http://smartdefine.org/date_line/definitions/1994558 |
| Chicago | Webster's. 2011. "date line" http://smartdefine.org/date_line/definitions/1994558 (accessed September 23, 2026). |
| Harvard | Webster's 2011, date line, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/date_line/definitions/1994558>. |
| MLA | Webster's. "date line" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/date_line/definitions/1994558> |