1 hour offset when using UTC timezones that have Daylight Saving Time in DateTimePicker

[victordomingospinto]

Describe the bug
If I am using the Material UI DateTimePicker https://mui.com/x/react-date-pickers/ and have my timezone as Europe/London or Europe/Lisbon, the moment I click on the calendar date I get an offset of 1h on my timestamp https://codesandbox.io/p/sandbox/3w6yfw but no offset at all if I only click directly on hour or minute. Also, the bug doesn't occur on UTC timezones that do not use Daylight Saving Time such as Africa/Lome or any other timezones.

I have also created this https://codesandbox.io/p/sandbox/datepicker-forked-jygfn7 with Luxon to find out where the bug is coming from and had no offset issues.

Expected behavior
No offset when I click on the DateTimePicker calendar day while using DayJs.

Information

• Day.js Version v.11.19
• OS: iOS and Windows
• Browser: Chrome, Firefox
• Time zone: GMT 00:00

[ace-tk]

Hi @victordomingospinto ,
I'd like to work on this issue. Could you please assign it to me.

[victordomingospinto]

Hi @ace-tk. I don't seem to have collaborator access to change that, unfortunately 😕

[ace-tk]

@victordomingospinto okay!

[ace-tk]

@iamkun , @Ayo1984 “Hi! I’ve fixed this issue and have opened a pull request
Whenever you get a chance, please review it. If everything looks good, kindly merge it. Thank you!”