World clock

如何使用World clock

它计算什么，何时使用

A live world clock that shows the 电流 时间、日期、cities around the world 的 UTC offset、和 how far ahead or behind each one 是 compared with you. Add the cities you need、the list 是 remembered in your browser. Daylight saving 是 handled automatically.

使用步骤

1. Your local 时间 shows 以 the top.
2. “Add a city” 的 Type a city name 和 press Add.
3. Pick 12-hour 或 24-hour style, 或 leave it automatic.
4. 删除 a city with the × button, 或 reset 至 the default list.

各输入项的含义

• Add a city – A city 从 the list, 或 a 时间 区间 名称 such as Asia/Karachi.
• Clock 样式 – Automatic follows your device, 或 choose 12-hour 或 24-hour.

如何阅读结果

• Local 时间 – Your 时间 和 日期, updated every second.
• City clocks – For 每件 city: the 时间、日期, UTC offset、difference 从 you.

公式

每件 时间 是 that city’s time zone. The difference from you 的 the current instant shown 是 the offset that zone minus your offset, from your browser’s time zone data, which includes daylight saving rules.

计算示例

When it 是 October 的 London 的 3:00 PM、it 是 Delhi 的 New York, 7:30 PM 的 10:00 AM、Tokyo. 的 11:00 PM

假设与局限

• Times come from your device’s clock, so they are only as accurate as it 是.
• Cities 占比 a 时间 区间, so one entry represents the whole 区间.
• The list 是 this browser. 的 stored only

常见错误

• Forgetting that daylight 节省 starts 和 different countries, so differences change during the year. 的 ends on different dates
• Assuming half-hour zones such as India 操作 not exist.
• Typing a 国家／地区 instead a city.

常见问题

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