It wasn't until World War I that daylight savings were realized on a grand scale.

直到第一次世界大战，人们才大规模地实现了夏令时。

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Around the world, people changed sleep patterns thanks to the start or end of daylight savings time.

在世界各地，由于夏令时的开始或结束，人们改变了睡眠规律。

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You must address daylight savings time by business rules.

必须用事务规则说明夏令时。

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The watch keeps itself on time by resetting for daylight savings time and time-zone changes.

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It takes months just to change the daylight savings rules, let alone the entire epoch of the operating system.

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Apple has traditionally had an issue with alarms and clocks at the turn of the new year and at daylight savings time changes.

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