Isoweek bug when customParseFormat is active

[Marouann]

Describe the bug When I try to get the iso week number from a date, the isoWeek function is not correct.

Information Bug has been reproduced in this sandbox

We get a very incoherent value :

• dayjs.utc("2024-01-16T22:00:00.000Z").locale("fr").tz("Europe/Paris").isoWeek() return 3
• dayjs.utc("2024-01-16T23:00:00.000Z").locale("fr").tz("Europe/Paris").isoWeek() return 2

That makes no sense, if A > B then A.isoWeek() >= B.isoWeek()

I don't really understand what is happening.

My guess is that when time is 23-23h59, the timezone makes the day change from 16 to 17 according to TZ. This day change leads to a decremented isoWeek.

I have tried to remove customParseFormat from used plugin and it started working. You can try it on the sandbox. However I need this plugin to make parse date in my TZ.

Thanks for your help.

[klm-turing]

@Marouann This PR fix the incorrect behaviour of ISO week plugin.