Timer operator does not work correctly on certain dates

[bretbas]

Bug Report

Current Behavior
The timer operator is emit value immediately when we pass the current date(now) with adding from 75 to 99 days

Reproduction
https://stackblitz.com/edit/angular-ivy-uuf9za?file=src/app/app.component.ts

[kwonoj]

I believe this is dupe of #3015.

[bretbas]

@kwonoj , But if this problem is due to overflow, then why does it work with dates adding days more than 99?

[kwonoj]

then why does it work with dates adding days more than 99?

it does not. If you only subscribe to date(100) for example,

const {timer} = require('rxjs');
const {mapTo} = require('rxjs/operators');

const addDays = (date, days) => {
  const d = new Date(date);
  d.setDate(d.getDate() + days);
  return d;
}

const now = new Date(Date.now());

const days = [
  timer(addDays(now, 74))
    .pipe(mapTo(74)),
  timer(addDays(now, 75))
    .pipe(mapTo(75)),
  timer(addDays(now, 99))
    .pipe(mapTo(99)),
  timer(addDays(now, 100))
    .pipe(mapTo(100))
]

days[3].subscribe((x) => console.log(x));

it emits warning

(node:13908) TimeoutOverflowWarning: 8643599998 does not fit into a 32-bit signed integer.
Timeout duration was set to 1.
(Use `node --trace-warnings ...` to show where the warning was created)
100

and duration falls back to default but not sync, so it emits asynchronously. If it correctly works, opening up page should not write any output since date due is set to more than one month.

[kwonoj]

closing as dupe.