iso format time

**Describe the bug**
error ISO_8601 does not exist in the typey of dayjs
Well as i understood that dayjs and moment have the same api, i just replaced it in code as
~~~TS
import * as moment from 'dayjs'; // the easiest way to upgrade my project.
const dataSample = [+moment(measurePoint.measureTime, moment.ISO_8601).format('x'), measurePoint.measureValue];
~~~
**Expected behavior**
The above line should work (as an api replacement).

**Information**
- Day.js: "dayjs": "^1.11.9",
- OS: Win 11
- Browser: chrome
- Time zone: iso time

Start by reproducing the TypeScript example with Day.js 1.11.9 and check the public parsing API and its type declarations. Compare the requested Moment-compatible ISO_8601 usage with existing parsing behavior and tests, if available. Done means the example type-checks and produces the expected formatted timestamp.

Written by the indexing model from the issue text.