Incorrect format() output after using utcOffset(0, true)

[iHaPBoy]

Describe the bug

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

dayjs.extend(utc);

const timezoneOffset = 0;
const startDate = dayjs('2025-01-06', 'YYYY-MM-DD').utcOffset(timezoneOffset, true);
const endDate = dayjs('2025-01-09', 'YYYY-MM-DD').utcOffset(timezoneOffset, true);
let d = startDate;
while (!d.isAfter(endDate)) {
  console.log('date', d.toISOString(), d.utcOffset(), d.format('YYYY-MM-DD'));
  d = d.add(1, 'day');
}

output:

date 2025-01-06T00:00:00.000Z 0 2025-01-06
date 2025-01-07T00:00:00.000Z 0 2025-01-06
date 2025-01-08T00:00:00.000Z 0 2025-01-07
date 2025-01-09T00:00:00.000Z 0 2025-01-08

Expected behavior

date 2025-01-06T00:00:00.000Z 0 2025-01-06
date 2025-01-07T00:00:00.000Z 0 2025-01-07
date 2025-01-08T00:00:00.000Z 0 2025-01-08
date 2025-01-09T00:00:00.000Z 0 2025-01-09

Information

• Day.js Version v1.11.13
• OS: macOS
• Node.js v20.12.0
• Time zone: UTC+8

[iamkun]

fixed in #2505