使用moment.js和moment-timezone.js从不同时区的日期减去1天 [英] Subtract 1 day from date in different timezone using moment.js and moment-timezone.js

问题描述

我想从现在的时间减去1天在不同的时区。 moment.js docs 表示将referenceTime用作从中减去一天的时间。下面的代码打印了当前时间在洛杉矶（第一），然后是从今天的时间1天前的时区，我目前在（第二），我希望它打印时间1天前从时区在洛杉矶

I want to subtract 1 day from the time now in a different timezone. The moment.js docs say to use referenceTime as the time to subtract one day from. The code below prints the current time in Los Angeles (first) and then the the time 1 day ago from today in the timezone I am currently in (second), I want it to print the time 1 day ago from the timezone in Los Angeles.

require moment = require('moment'),
        moment_tz = require('moment-timezone');

var referenceTime = moment_tz().tz("America/Los_Angeles").format();
console.log(referenceTime);
var referenceTimeMinusOne = moment().subtract(1,'days').calendar(referenceTime);
console.log(referenceTimeMinusOne); 

推荐答案

没关系，它运行于UTC和

It doesn't matter, it operates on UTC and converts afterwards.

moment = require('moment-timezone');

var la = moment().tz("America/Los_Angeles")
var nl = moment().tz("Europe/Amsterdam")

console.log('now:')
console.log(la.format());
console.log(nl.format());

var earlier_la = la.subtract(1,'days')
var earlier_nl = nl.subtract(1,'days')

console.log('\nearlier:')
console.log(earlier_la.format());
console.log(earlier_nl.format());

// Earlier Dutch time converted back to Los Angelos equals 
// Earlier Los Angelos time
console.log(earlier_nl.tz('America/Los_Angeles').format());

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