Last Updated：2025/11/20
The practice in some places of adjusting clocks forward in the spring and back in the fall, usually by one hour, so that the adjustment causes the time to coincide with the greatest period of illumination by the sun over the course of the day.
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daylight saving time
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Source Word
daylight saving time
Noun
countable
uncountable
Japanese Meaning
夏時間（サマータイム）：春に時計を1時間進め、秋に1時間戻すことで、日中の太陽光が最も多く利用できるように調整する制度。
（ plural ）
