weekOfYear shows wrong calender week at the turn of the year

[ttusek]

Describe the bug
The 2020-12-30 should be calender week 53 but it shows as calender week 1.
(similar issue: #760)

Calender weeks:
http://www.whatweekisit.org/

Information

Day.js Version 1.9.7
Browser Chrome latest

[iamkun]

Hi, have you set the correct locale?

[ttusek]

yes, it is the same issue when i set 'us' | 'de'
https://codepen.io/tompach/pen/OJRRpNE?editors=0012

[ChuanfengZhang]

@iamkun I have the same issue.
https://codepen.io/Chuanfeng/pen/PoGBwrp?editors=0002

[iamkun]

You can use en-gb locale to get the correct result ATM.

will update some other locale like en-us, de to set correct year star day.

[Uninen]

I have this same issue. Using en-gb as locale doesn't seem to fix it. Can't get to week 53 with any locale I've tried.

[iamkun]

@Uninen a reproduction demo please? you can share your code here https://runkit.com/npm/dayjs

[Uninen]

Sure, here: https://runkit.com/embed/5wk28cq51vf9

(Note, the dates here are dynamic so this example may or may not work in the future.)

Week for Mon Dec 28 2020 returns 1 (should be 53), week for Sun Jan 10 2021 returns 3 (should be 1) using locale en-gb.

[iamkun]

@Uninen this is because you haven't load en-gb locale https://day.js.org/docs/en/i18n/loading-into-nodejs

[Uninen]

Oh! 🤦‍♂️ Thanks, it works with en-gb locale when the locale is properly set.

Sorry about the noise. I missed the import as there were no errors or even TypeScript hints with the locale-call even though it wasn't imported.

[iamkun]

🎉 This issue has been resolved in version 1.10.3 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀