Why does the date in Angular get 3 hours late?

Question

Angular

I am writing tests in Angular 13 using Jest.

At the very beginning, in describe('', () => {}) I create a field for the date Next, after .compileComponents(), I write the date in the defaultDate field and then immediately display it in the console
let defaultDate: Date;

defaultDate = new Date(2021, 1, 1, 0, 0, 0);
console.log('default date is', defaultDate);

I run a test that checks that the component was just created and the date is displayed in the terminal 2021-01-31T21:00:00.000Z.
If I display the same date in the devTools console in GoogleChrome, then the value that I set in the date is displayed there -

Mon Feb 01 2021 00:00:00 GMT+0300 (Москва, стандартное время)

I googled and found 2 links on this topic:
https://ru.stackoverflow.com/questions/770059/%D0%...
https://stackoverflow.com/questions/55005125/date-...

Alas, I'm all I still didn’t understand why 3 hours were taken away from the date where I specifically set all the parameters.
Please can someone explain in layman's terms why Angular (or Jest) changes the date as opposed to the DevTools console.

Answer 1

2021-01-31T21:00:00.000ZZ is Greenwich Mean Time.
Mon Feb 01 2021 00:00:00 GMT+0300GMT+3 is in Moscow.
The time is the same, but the output is in different formats.