Date Format property in DatePicker not working on Windows with date Format

Description

I have defined three DatePickers on a Xaml page. <DatePicker Date="02/25/2022" Format = "dd.mm.yyyy"/> <DatePicker Date="02/25/2022" Format = "dd/mm/yyyy"/> <DatePicker Date="02/25/2022" Format = "mm/dd/yyyy"/>

This is shown like that on Windows. The french format “mm/dd/yyyy” is ocrrect but the German is showing only the day. On Android the month is set to 0.

And like that on an Android Phone

I had expected to see the controls showing three different date formats but this is not the case. I also tried to set the date format in code behind using the formats from CultureInfo.CurrentCulture.DateTimeFormat but this did not work either.

A similar problem was discussed in issue #7972

Steps to Reproduce

Create a new .NET MAUI app Add a DatePicker to the app with the format set to the German format. The separator is a ". here. <DatePicker Date="02/25/2022" Format = "dd.mm.yyyy"/> <DatePicker Date="02/25/2022" Format = "dd/mm/yyyy"/> <DatePicker Date="02/25/2022" Format = "mm/dd/yyyy"/>

Link to public reproduction project repository

https://github.com/FrankPohl/DatePickerError

Version with bug

6.0.400

Last version that worked well

Unknown/Other

Affected platforms

Android, Windows

Affected platform versions

Windows SDK 10.0.19041.0 and Android Framework 29.0

Did you find any workaround?

No

Relevant log output

No response

[MatthewB05]

In fact it’s not just the date format that’s broken, the entire control is ignoring regional settings on windows - the day/month names are in English and the week starting dates are all out by one day. On Android these are both correct.

[pocki]

The weekdays and months also wrong (english in my case) even if you set the language handler.PlatformView.Language in @MatthewB05 workaround.