Jisho

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Noun
1. daylight saving time; daylight savings time; summer time
Wikipedia definition
2. Daylight saving timeAlthough not used by most of the world's countries, daylight saving time is common in the Northern Hemisphere's northern latitudes.   DST observed   DST formerly observed   DST never observed]] Daylight saving time (DST)—also summer time in several countries, in British English, and European official terminology—is the practice of advancing clocks so that evenings have more daylight and mornings have less.
Read “Daylight saving time” on English Wikipedia
Read “夏時間” on Japanese Wikipedia
Read “Daylight saving time” on DBpedia

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