Obtain the UTC timestamp from the current local time on the same day

Imagine knowing the current time (hh:mm:ss) without the date, but you're certain it's today:

12:34:56

Additionally, you know that the time is in the CST timezone (UTC +0800). Your goal is to obtain a timestamp based on this time.

If we consider the present UTC time as 2014/08/25 17:10:00 and CST as 2014/08/26 01:10:00 (UTC +0800), indicating that CST is already on the next day. Therefore, using something like this won't work:

var d = new Date().toJSON().slice(0,10);
// "d" returns "2014-08-25" in local time -> this is incorrect

The objective is to convert:

1:10 (CST) --> to 2014/08/25 17:10 (UTC) or its corresponding timestamp 1408986600

Is it possible to determine the complete date-time or timestamp when having knowledge of only the time and timezone?

javascripttimestampunix-timestamputc

Answer №1

If you want to customize the attributes of a Date object, you have the option to manipulate them directly:

let currentTime = new Date();

currentTime.setHours(7);
currentTime.setMinutes(30);
currentTime.setSeconds(45);

console.log(currentTime.toTimeString());

Answer №2

This solution seems to provide an efficient method using moment-timezone.js:

// Representing time as hh:mm:ss in CST timezone
var cst_time = '1:10:00'; 

// Obtain today's date in the CST timezone
var cst_today = moment.tz("Asia/Shanghai").format("YYYY-MM-DD"); 

// Convert the given date and time from CST to UTC and format it accordingly
var timestamp = moment(cst_today + " " + cst_time + " +0800").utc().format("YYYY/MM/DD HH:mm:ss");

// The output should be "2014/08/25 17:10:00", which appears to be accurate
console.log(timestamp);

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