django form datefield with runtime formatting

So, I have a form:

class FormBasicInfo(BasicForm):
    valid_from = forms.DateField(required=False, input_formats=('%d/%m/%Y',), widget=DateInput(format='%d/%m/%Y'))

and I set the input and output formats. However, what if I want to set these formats at runtime, based on the date format preference of my user? how can that be done?

The way it is done abo开发者_开发问答ve, the form will always validate against the European date format. Even if I specify more formats which is allowed, one of them will be first and take priority which means there will be cases when the validation will be done incorrectly.

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You can override the __init__ method of the form class to customize the input_formats and widget. For e.g.

class FormBasicInfo(BasicForm):
    ....

    def __init__(self, *args, **kwargs):
        super(MForm, self).__init__(*args, **kwargs)
        valid_from = self.fields['valid_from']
        format = look_up_format_based_on_locale()
        valid_from.input_formats = (format,)
        valid_from.widget = forms.DateInput(format=format)

Where look_up_format_based_on_locale() is an abstraction for looking up the date format based on the user's locale. It should return an appropriate format string, say "%m/%d/%Y".