在 Javascript 中创建时区独立日期？

Question

This question is related to this question and this question .

So if we construct a date using an ISO string like this:

new Date("2000-01-01")

Depending on what timezone we are in, we might get a different year and day.

I need to be able to constructor dates in Javascript that that always have the correct year , day , and month indicated in a string like 2000-01-01 , and based on the answer in one of the questions if we use back slashes instead like this:

const d = new Date("2000/01/01")

Then we will always get the right year , day , and month when using the corresponding date API methods like this:

d2.getDate();
d2.getDay();
d2.getMonth();
d2.getFullYear();

So I just wanted to verify that my understanding is correct?

Ultimately I need to be able to create Date instances like this for example:

const d3 = new Date('2010/01/01');
d3.setHours(0, 0, 0, 0);

And the time components should always be zero, and the year , month , and day should be the numbers specified in the string.

Thoughts?

I just did a quick test with this: https://stackblitz.com/edit/typescript-eztrai

const date = new Date('2000/01/01');
console.log(`The day is ${date.getDate()}`);
const date1 = new Date('2000-01-01');
console.log(`The day is ${date1.getDate()}`);

And it logs this:

The day is 1
The day is 31

So it seems like using backslashes should work...

Or perhaps using the year, month (0 based index), and day constructor values like this:

const date3 = new Date(2000, 0, 1);
date3.setHours(0, 0, 0, 0);
console.log(`The day is ${date3.getDate()}`);
console.log(`The date string is ${date3.toDateString()}`);
console.log(`The ISO string is ${date3.toISOString()}`);
console.log(`Get month ${date3.getMonth()} `);
console.log(`Get year ${date3.getFullYear()} `);
console.log(`Get day ${date3.getDate()} `);

Answer 1

Perhaps you want to take a look at Date.UTC

new Date(Date.UTC(2000, 0, 1))

If you want to later set the date to something different, use an equivalent UTC method (eg setUTCHours ).

When you retrieve the date, also make sure to use the UTC methods (eg getUTCMonth ).

If you need to pass in an ISO string make sure you include the time offset of +00:00 (is often abbreviated with z )

new Date("2000-01-01T00:00:00Z");

If you want to retrieve the date in a specific format you can take a look at Intl.DatTimeFormat , just remember to pass in timeZone: "UTC" to the options .

 const date = new Date("2000-01-01T00:00:00Z"); const dateTimeFormat = new Intl.DateTimeFormat("en-GB", { timeZone: "UTC" }); console.log(dateTimeFormat.format(date));