from django import forms

from django.core.validators import ValidationError

from django.utils import timezone

from .models import Assignment

from .terms import TERMS

def validate_in_past(value):

        raise ValidationError('Enter a date in the past')

class AssignmentForm(forms.ModelForm):

    period_begins = forms.DateField(

        label='Assign the copyright in my above contributions starting on',

        help_text='You can use the day you first started contributing (or, equivalently, your date of birth), or any later date.',

        required=True,

        widget=forms.DateInput(attrs={'type': 'date'}),

        validators=[validate_in_past],

    )

    period_end_type = forms.ChoiceField(