出典:Wikipedia
出典:『Wikipedia』 (2011/07/29 09:15 UTC 版)
Daylight Saving Time (DST)—also summer time in British English and European official terminology (see )—is the practice of temporarily advancing clocks during the summertime so that afternoons have more daylight and mornings have less. Typically clocks are adjusted forward one hour near the start of spring and are adjusted backward in autumn. Modern DST was first proposed in 1895 by George Vernon Hudson. Many countries have used it since then; details vary by location and change occasionally.