最終更新日：2025/11/20

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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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daylight saving time

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日本語の意味

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。

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Many people forget to adjust their schedules when daylight saving time begins, leading to missed appointments and groggy mornings.

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多くの人は、春に時計を1時間進め、秋に1時間戻す慣行が始まると予定の調整を忘れてしまい、約束に遅れたり朝にぼんやりしたりします。

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意味（1）

2005: answers.firstgov.gov -- Daylight Saving Time is a change in the standard time of each time zone. ... The American law by which we turn our clock forward in the spring and back in the fall is known as the Uniform Time Act of 1966. The law does not require that anyone observe Daylight Saving Time; all the law requires is that if we are going to observe Daylight Saving Time, it must be done uniformly. http://answers.firstgov.gov/cgi-bin/gsa_ict.cfg/php/enduser/std_adp.php?p_faqid=6880

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詳細

daylight saving times

（ plural ）

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daylight saving time

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daylight saving time

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