How to increase the year of widget DateField
===

I have a form follow as:

    class UserProfileUpdateForm(forms.ModelForm):
        birthday = forms.DateField(widget=forms.DateInput(attrs={"class": "datepicker input-medium"}, format=('%m/%d/%Y')),
            error_messages={'required': 'Birthday is required.'})

This date picker only displays the year from 1900 to 2012. So, user can not choose a date in 2013 or the future year. Please see the picture below.

Thanks

![enter image description here][1]


  [1]: http://i.stack.imgur.com/i0JVU.jpg