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The idea of daylight saving time start with an American named Benjamin Franklin(1706~1790).He explained how a lot of the money spent on candles used for light(this was before electricity) could be saved if everyone woke up earlier and went to bed earlier. Even though Franklin's idea had a clear meaning, most people didn't want to get up earlier than they had to.Who would? It was not until 1970 that an Englishi man named William Willet came up with a way to 'make' the sun set later .His idea was to turn clocks forword by 20 minutes on each the four Sundays in April for a totai of 80 minutes. William's idea was laughed at ,at first. But when World War I started in 1914, many countries decided they had to save energy for the war. Daylight saving time has other uses. The more time you spend outsaid playing, the less time you are spending in front of the computer or the TV.These things also use energy. Also, daylight saving time sometimes causes problems.For example, China used it in 1986---but stopped it in 1991. That was because the temperatures are quite different from North to south and time from East to West. If the people from northwest part of China use daylight saving time, sometimes they have to get up to work when it is not very bright outside. That will cause some trouble for them. Still,most parts of the word do have daylight saving time, and most people look forward to the extra hour of evening light.

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参考译文：
夏时制在（1706-1790）由美国一个叫班杰明·富兰克林提出。他解释说，如果我们早睡早起，可以节省很多用于采光的蜡烛的费用（在电器时代之前）。
尽管富兰克林的想法意义明确，但很多人还是不愿意更早地起来。谁愿意呢？
直到1907年有个叫威廉的英国人想了一个让太阳迟来的方法。他的想法把钟在四月的每个周日提前20分钟，这样就可以提前了80分钟。
威廉的想法开始被嘲笑，但是当第一次世界大战在1914年开始时，许多国家认为他们需要为战争节省能源，所以他们试用了威廉的方法。
夏时制还有另一种用途，你在外面玩耍的时间越多，你玩电脑或看电视的时间越少，你就节约了更多能量。
尽管如此，夏时制有时候也有些问题。中国在1986年使用它，但又在1991年停用，原因是因为从南到北温度的差异很大，而从东到西也有时差。
如果人们从中国北方运用夏时制，他们需要天不亮就起订工作，这也带来了一些麻烦。
如果中国西北部的人使用夏令时，有时他们不得不在天不是很亮时起床去工作。那会给他们带来一些不便。
到现在为此，世界很多地方都有用夏时制，大多数人都期待夜晚多余的时光。
最终答案：略