World time zones (dateline): What is the imaginary line on Earth that closely follows the 180° meridian and separates two consecutive calendar dates? Note: it zigzags to pass around landmasses and island groups. Choose the correct term.

Concept/ApproachThe International Date Line (IDL) is the notional line roughly along 180° longitude where the date changes. It deviates around islands for practical timekeeping and political boundaries.

Final AnswerInternational Date Line