2026年3月6日 / 美国东部时间上午6:00 / CBS新闻
作者：
亚历克斯·桑德比（Alex Sundby）高级编辑
亚历克斯·桑德比是CBSNews.com的高级编辑。除了编辑内容外，亚历克斯还报道突发新闻，撰写有关犯罪和极端天气的文章，以及从多州彩票头奖到7月4日热狗吃比赛的所有内容。
[阅读完整简历]
夏令时（俗称“日光节约时”）将于2026年开始实施，这意味着大多数美国人将在本周末“春调”时钟时失去一小时睡眠。近20年来，每年将时钟调快一小时的仪式都在3月的第二个星期日进行。
夏令时到底是什么？
通过将时钟调快一小时，夏令时实际上将早晨的一小时 daylight 转移到了晚上。
例如，根据美国国家气象局的数据，在时钟变更生效前一天的周六，波士顿的日出时间为上午6:09，日落时间为下午5:41。周日时钟调整后，日出时间为上午7:08，日落时间为下午6:42。
2026年3月夏令时从何时开始？
今年，夏令时将于美国东部时间3月8日（星期日）凌晨2点开始，即当地时间。
美国海军天文台（美国国防部官方时间来源）称，自2007年以来，开始日期一直是3月的第二个星期日。
在2007年之前的二十年里，夏令时从4月的第一个星期日开始。1987年之前，1966年《统一时间法》规定开始日期为4月的最后一个星期日。
根据美国国会研究服务处的数据，在1970年代能源危机期间，国会决定尝试全年实行夏令时，1974年1月的第一个星期日开始实施。
这一实验未能持续全年，该国于当年10月恢复标准时间，然后在1975年2月的最后一个星期日重新开始夏令时。1975年后，开始日期又回到了4月。
3月夏令时我们是失去还是获得一小时？
美国大部分地区将在周日凌晨2点将时钟调快一小时至3点，因此会失去一小时。
我们在实际春季开始前“春调”时钟，而春季于3月20日春分开始。
2026年夏令时何时结束？
大多数美国人将在11月的第一个星期日凌晨2点“秋调”回标准时间，今年的这一天是11月1日。届时，距离9月22日秋分已经过去近六周，正值秋季。
根据为美国提供官方时间的政府机构美国国家标准与技术研究院的数据，夏令时将持续238天。
我们为什么实行夏令时？
根据美国国会研究服务处，美国于1918年首次采用夏令时，目的是在第一次世界大战期间节约燃料。二战期间也出于同样原因使用，并根据国防部规定“促进国家安全和国防”。
这一每年的时间调整自1960年代以来一直有效，但尚未被证明能显著减少能源消耗。美国运输部在1974年发现，在节约能源、交通安全和减少暴力犯罪方面收效甚微。
2007年将夏令时开始日期提前后，美国能源部发现用电量下降了0.03%。这一调整还与一些负面健康影响有关。
哪些州不实行夏令时？
只有两个州不实行夏令时：夏威夷和亚利桑那州（亚利桑那州东北部的纳瓦霍族除外）。
美属萨摩亚、关岛、北马里亚纳群岛、波多黎各和美属维尔京群岛的领土也不调整时钟。
我的手机会自动调整夏令时吗？
如果手机设置为自动更新，则应该会自行更新时间。
苹果、谷歌和三星都有帮助用户更改设备时间的支持页面，Straight Talk和Tracfone等运营商也有摩托罗拉用户的设置说明。
相关主题：
- 夏令时
夏令时如何影响你的健康
https://www.cbsnews.com/video/how-daylight-saving-time-affects-your-health/
夏令时如何影响你的健康
（02:01）
Daylight saving time 2026 starts soon. Here’s when the time changes and more key details.
March 6, 2026 / 6:00 AM EST / CBS News
By
Alex Sundby Senior Editor
Alex Sundby is a senior editor at CBSNews.com. In addition to editing content, Alex also covers breaking news, writing about crime and severe weather as well as everything from multistate lottery jackpots to the July Fourth hot dog eating contest.
Read Full Bio
Daylight saving time, the yearly time change colloquially known as daylight savings, is set to start for 2026, meaning most Americans will lose an hour of sleep when they “spring forward” this weekend. For nearly 20 years, the annual ritual of moving clocks an hour ahead has taken place on the second Sunday of March.
What is daylight saving time, exactly?
By shifting clocks forward an hour, daylight saving time effectively moves an hour of daylight from the morning to the evening.
For example, on Saturday, the day before the time change takes effect, sunrise in Boston will be at 6:09 a.m. and sunset at 5:41 p.m., according to the National Weather Service. On Sunday, after the clocks change, the sun will rise at 7:08 a.m. and set at 6:42 p.m.
What day and time does daylight saving time start for March 2026?
This year, daylight saving time starts on Sunday, March 8, at 2 a.m. local time.
The start date has been on the second Sunday of March since 2007, according to the U.S. Naval Observatory, the official source of time for the Defense Department.
For the two decades preceding 2007, daylight saving time began on the first Sunday of April. Before 1987, the Uniform Time Act of 1966 set the start date as the last Sunday of April.
During the energy crisis of the 1970s, Congress decided to try year-round daylight saving time, beginning on the first Sunday of January in 1974, according to the Congressional Research Service.
The experiment didn’t last the full year, with the country going back to standard time that October and then resuming daylight saving time on the last Sunday of February in 1975. After 1975, the start date went back to April.
Do we lose or gain an hour for daylight saving time in March?
Most of the U.S. will lose an hour Sunday from the changing of the clocks — at 2 a.m. the time jumps ahead to 3 a.m.
We “spring forward” ahead of the actual beginning of spring, which comes with the vernal equinox on March 20.
When will daylight saving time end for 2026?
Most Americans will “fall back” to standard time at 2 a.m. local time on the first Sunday of November, which this year is on Nov. 1. By then, the country will be nearly six weeks into fall after the autumnal equinox on Sept. 22.
Daylight saving time will be in effect for 238 days, according to the National Institute of Standards and Technology, a government agency that provides the official time for the U.S.
Why do we have daylight saving time?
Daylight saving time was first adopted in the U.S. in 1918 in an effort to conserve fuel during World War I, according to the Congressional Research Service. It was used during World War II for the same reason and to “promote national security and defense,” according to the Defense Department.
The annual time change has been in effect consistently since the ’60s, but it hasn’t been found to be a significant source of decreasing energy consumption. In 1974, the Transportation Department found it had minimal benefits when it came to energy conservation, traffic safety and reducing violent crime, according to the Congressional Research Service.
After daylight saving time’s start date was moved up in 2007, the Energy Department found electricity consumption fell by 0.03%. The time shift has also been associated with some negative health effects.
Which states don’t do daylight saving time?
Only two states don’t observe daylight saving time: Hawaii and Arizona, with the exception of the Navajo Nation in the northeast part of the Grand Canyon State.
The territories of American Samoa, Guam, the Northern Mariana Islands, Puerto Rico and the U.S. Virgin Islands also don’t change their clocks.
Will my phone change time for daylight saving automatically?
Phones should update with the time change on their own if they’re set to update automatically.
Apple, Google and Samsung have support pages for people who need help changing the time on their devices, and carriers like Straight Talk and Tracfone have instructions for Motorola users.
In:
- Daylight Saving Time
How daylight saving time affects your health
https://www.cbsnews.com/video/how-daylight-saving-time-affects-your-health/
How daylight saving time affects your health
(02:01)
发表回复