daylight saving time

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For example, here is a Knowledge Collection document about migration planning and another on Daylight Saving Time.
例如，這裡就是關於遷移計劃的知識集錦文档和關於夏令時的知識集錦文档。
In the State of Iowa, in 1964, there were 23 different pairs of starting and ending dates of daylight saving time in use in that one state.
1964年,光是在艾奧瓦州就一共有23組夏令時開始、結束的不同時間。儅時在六十年代,你可以乘坐一趟著名的班車。
First a reminder: Starting this year, Daylight Saving Time in the US and several other countries will start three weeks earlier than in previous years.
首先是一則提示：從今年開始，美國和其他幾個國家將比往年提前三周實施夏令時。

Clocks are one of the biggest problems when daylight saving time kicks in.
FORBES: A Lesson In Keeping An Elderly Parent Safe In Their Own Home
None of us have the luxury of finding more time by simply turning back the clock — except when Daylight Saving Time ends.
FORBES: Capture an Hour When You Turn Back the Clock

the time set usually one hour later in summer so that there is a longer period of daylight in the evening

Daylight saving time is a period of time in the summer when the clocks are set one hour forward, so that people can have extra light in the evening.