夏なつ時じ刻こくなつじこくMeanings1noundaylight saving time; summer timeRefers to the practice of advancing clocks during summer months. The more common term is 夏時間 (なつじかん).See also: 夏時間夏なつ時じ刻こくが始はじまると、日ひが長ながく感かんじられる。When daylight saving time starts, the days feel longer.