In Britain they change the clocks twice a year.

在英国人们每天调两次时钟。

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Safety officials also suggests as you change your clocks change the batteries in your smoke detectors.

安全官员建议在调表的同时，也要更换烟雾探测器的电池。

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US scientists want to change the current system, which keeps clocks in synch with solar time by adding a leap second every 18 months or so.

美国科学家希望改变现行系统，亦即透过每隔约18个月添增1闰秒，让时钟与太阳时保持一致。

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He assured MPs the bill did not mean devolved governments could arbitrarily change the clocks, stressing that it was merely about having the "right" to do so.

BBC: Let nations set their own time zones - peer

Presenting his Devolution (Time) Bill to the Lords on 1 July 2011, Lord Tanlaw said that Holyrood and the Welsh Assembly should be given the "right to choose" whether to change the clocks in their nations, highlighting that Northern Ireland already had the power to do so.

BBC: Let nations set their own time zones - peer

"Countries could just accommodate the divergence by not putting their clocks forward in the spring, so you'd change your time zone by one hour to bring civil time back into line with the Earth's rotation, " added Dr Whibberley.

BBC: Changes to the world's time scale debated