I'm working on a small project and need to obtain the current time in JavaScript specifically for Shanghai. Does anyone have any tips or recommendations on how I can achieve this efficiently?
I'm working on a small project and need to obtain the current time in JavaScript specifically for Shanghai. Does anyone have any tips or recommendations on how I can achieve this efficiently?
Being the lazy person that I am, I decided to utilize moment.js:
let current = moment();
let timeInTokyo = current.tz('Asia/Tokyo').format('h:mma');
In China, the entire country observes a single timezone known as UCT+08:00. If you need to determine the current time in Shanghai based on the system settings of the host, you can calculate it by obtaining the local time, factoring in the timezone offset (ECMAScript measures timezone offset in minutes to adjust to UTC, so for instance, UTC+10:00 would be -600), and then additionally incorporating the offset specific to Shanghai:
function timeInShanghai() {
function z(n){return (n<10?'0':'') + n}
var d = new Date();
d.setMinutes(d.getMinutes() + d.getTimezoneOffset() + 480);
return z(d.getHours()) + ':' + z(d.getMinutes()) + ':' + z(d.getSeconds());
}
This method may not be entirely reliable if there are changes in the timezone rules or the implementation of daylight saving time.
Shanghai operates on a timezone offset of +8 hours. In order to obtain the current date and time:
let currentTime = new Date().getTime();
To break down the time into hours, minutes, and seconds:
seconds = parseInt((currentTime / 1000) % 60);
hours = parseInt((currentTime / (1000 * 60 * 60)) % 24) + 8; \\adjusting for the offset
minutes = parseInt((currentTime / (1000 * 60)) % 60);
To display the time in string format:
console.log(hours + ":" + minutes + ":" + seconds);
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