DateInput default date is not shown when localization is on

[Marco Zatta]

Step to reproduce:

• Create a Model with a date field
• Create a ModelForm based on said model with a widget entry to make the date a DateInput (otherwise it is shown as text field)
• With localization turned on set LANGUAGE='it-ch'
• Open a webpage showing the form with {{ form }} in the template

With 'it-ch' the default value is not shown because the value passed to the field is not understood by the browser (in this case '%d/%m/%Y'), while it is shown when using 'en-us' (in this case '%Y-%m-%d is passed)

Expected behavior:
The default date is shown independently of the locale selected server side

[Tim Graham]

This sounds like a browser issue and not Django's fault?

[Mariusz Felisiak]

Thanks for the report, however I cannot reproduce this issue. Can you provide a minimal project to reproduce?

[Claude Paroz]

This is closely related to #33113. Typically, when you are using a date input widget, the initial input value should be normalized to the YYYY-MM-DD iso format (see ​https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/date). The discussion could continue on #33113.