Javascript 以小时为单位查找与时区的时差

Question

I have a javascript object with the following details:

 var dateobj = { date: "2020-12-21 03:31:06.000000", timezone: "Africa/Abidjan", timezone_type: 3 } var date = new Date(); var options = { timeZone: dateobj.timezone }; var curr_date = date.toLocaleString('en-US', options) console.log(curr_date) //I want this //diff = curr_date - dateobj.date

I want to find the time difference in hours with the current date-time of the same timezone. I know I can use toLocaleString() function to get the date-time string in a particular timezone, but how can I find the time difference? The above code gets the current date time in that timezone, how can I find the time difference in hours?

Answer 1

In general when working with dates in JS I usually use a library called date-fns (Date functions). It just makes dates and time a lot easier to manage. This is how you would get the time difference in hours with date-fns .

const { differenceInHours } = require("date-fns"); 
const { zonedTimeToUtc } = require("date-fns-tz");

const timeData1 = {date: "2020-12-21 03:31:06.000000", timezone: "Africa/Abidjan", timezone_type: 3};
const timeData2 = {date: "2020-12-21 03:31:06.000000", timezone: "America/Los_Angeles", timezone_type: 3};

const t1 = zonedTimeToUtc(timeData1.date, timeData1.timezone);
const t2 = zonedTimeToUtc(timeData2.date, timeData2.timezone);

const diff = differenceInHours(t2, t1);

console.log(diff);
// => 8

Run demo: https://runkit.com/embed/jtfu0ixxthy7