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，这里就是关于迁移计划的知识集锦文档和关于夏令时的知识集锦文档。
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,光是在艾奥瓦州就一共有23组夏令时开始、结束的不同时间。当时在六十年代,你可以乘坐一趟著名的班车。
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.
首先是一则提示：从今年开始，美国和其他几个国家将比往年提前三周实施夏令时。

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.