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class PeriodicEventsSearchForm(forms.Form):

    start_date = forms.DateField(required=True, localize=True)

    end_date = forms.DateField(required=False, localize=True)

    def clean(self):

        cleaned_data = super(PeriodicEventsSearchForm, self).clean()

        if cleaned_data.get('start_date') and cleaned_data.get('end_date'):

            if cleaned_data['start_date'] > cleaned_data['end_date']:

                raise forms.ValidationError(u'La date de début doit être supérieure à la date de fin')

        return cleaned_data