Why can't all dates return the correct date based on the timezone?

[telenconcept]

import dayjs from 'dayjs';
import utc from 'dayjs/plugin/utc';
import timezone from 'dayjs/plugin/timezone';

dayjs.extend(utc);
dayjs.extend(timezone);

dayjs.tz.setDefault('America/New_York');

const time1 = dayjs.tz('2024-12-11T12:37:43.000Z', 'America/Toronto').format('YYYY-MM-DD HH:mm');
console.log(time1);
const time2 = dayjs.tz('2024-12-11T12:37:43.000Z', 'America/New_York').format('YYYY-MM-DD HH:mm');
console.log(time2);
const time3 = dayjs.tz('2024-12-11T12:37:43.000Z', 'Asia/Hong_Kong').format('YYYY-MM-DD HH:mm');
console.log(time3);

export default dayjs;

Result: time1 = 2024-12-11 12:37
time2 = 2024-12-11 12:37
time3 = 2024-12-11 12:37

"dayjs": "^1.11.13"

Why can't all dates return the correct date based on the timezone?

[siratl]

Isn't the intention of dayjs.tz.setDefault('America/New_York'); to always return your timezone in the default 'America/New_York'? if so then that seems to be what it is doing.

[telenconcept]

Isn't the intention of dayjs.tz.setDefault('America/New_York'); to always return your timezone in the default 'America/New_York'? if so then that seems to be what it is doing.

"dayjs.tz.setDefault('America/New_York'); " should be a global setting, but in specific situations, you might want to obtain the time based on other timezones, such as dayjs.tz('2024-12-11T12:37:43.000Z', 'America/Toronto') or dayjs.tz('2024-12-11T12:37:43.000Z', 'Asia/Hong_Kong'). Since the second parameter specifies a different timezone, shouldn't it return the time for that corresponding timezone?