2000年問題にせんねんもんだいにせんねんもんだいMeanings1nounY2K problem; year 2000 problemhistorical termcomputingHistorical computing term referring to the bug expected when dates rolled over to the year 2000.2000年ねん問もん題だいに備そなえて、多おおくの企き業ぎょうがシステムを改かい修しゅうした。In preparation for the Y2K problem, many companies updated their systems.