javascript 使用Javascript从时区名称获取时区偏移量
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Get timezone offset from timezone name using Javascript
提问by Hardik Sondagar
I found many solution that gives Timezone name from offset value. But I have Timezone name and I want offset value for that. I tried setTimezone('Asia/Kolkata'), but I think their is no method like setTimezone.
我找到了许多从偏移值给出时区名称的解决方案。但我有时区名称，我想要偏移值。我试过 setTimezone('Asia/Kolkata')，但我认为它们不像 setTimezone 那样的方法。
example:
例子：
Asia/Kolkata should give me -330 ( offset )
回答by Matt Johnson-Pint
You can't get it by name alone. You would also need to know the specific time. Asia/Kolkatamay be fixed to a single offset, but many time zones alternate between standard time and daylight saving time, so you can't just get theoffset, you can only get anoffset.
仅凭名字是无法得到它的。您还需要知道具体时间。 Asia/Kolkata可以固定到一个单一的偏移，但很多时区的标准时间和夏令时之间交替，所以你不能只是得到了弥补，你只能得到一个偏移量。
For how to do it in JavaScript, see this answer.
有关如何在 JavaScript 中执行此操作，请参阅此答案。
回答by Nathan Dullea
Using countries and timezonesnpm package:
使用国家和时区npm 包：
import {getTimezone} from 'countries-and-timezones';
const australianTimezone = 'Australia/Melbourne';
console.log(getTimezone(australianTimezone));
Prints to the console:
打印到控制台：
{
name: 'Australia/Melbourne',
country: 'AU',
utcOffset: 600,
utcOffsetStr: '+10:00',
dstOffset: 660,
dstOffsetStr: '+11:00',
aliasOf: null
}
From there, you can use the utcOffset or dstOffset depending on if it is daylight savings time.
从那里，您可以根据是否为夏令时使用 utcOffset 或 dstOffset。
