dayjs returns wrong object when created using year week string YYYY-w

[albert-cai]

Describe the bug
When creating dayjs object from year week string such as 2020-35, the created object contains the wrong month and date information.

For example:

dayjs('2020-35', 'YYYY-w'). //Wed Jan 01 2020 00:00:00
dayjs('2020-35', 'YYYY-w').format('YYYY-w'). //2020-1

Expected behavior
dayjs should return the right object.

Information

• Day.js Version 1.8.33
• OS: macos
• Browser chrome84
• Time zone: GMT+08:00

[iamkun]

Day.js does not support parsing w token but will add it in the future.

List of all available parsing tokens https://day.js.org/docs/en/parse/string-format#list-of-all-available-parsing-tokens

[PengJiyuan]

any progress?