DateTimeField Validation Error

I don't get why I'm getting a validation error with my code. I thought
that all of the built in fields are referenced inside of "from
django.db import models". Thanks for any help that you may offer.

ERROR

NameError: name 'DateTimeField' is not defined

CODE

#shifts.models.py

from django.db import models
from django.contrib.auth.models import User

# Create your models here.
class Shift(models.Model):

SHIFT_OPTIONS = (
('Shift A', 'Shift A'),
('Shift B', 'Shift B'),
('Shift C', 'Shift C'),
('Shift D', 'Shift D'),
)
name = models.CharField(max_length=7, choices=SHIFT_OPTIONS,
verbose_name='Shift Name')
date = models.DateField()
start_time = models.TimeField()
end_time = models.TimeField()

class Schedule(models.Model):

# Shift
shift = models.ForeignKey(Shift, unique=True)

# User
user = models.ForeignKey(User, unique=True)

# Other
STATUS_OPTIONS = (
('Pending', 'Pending'),
('Approved', 'Approved'),
('Denied', 'Denied'),
)
status = models.CharField(max_length=7, choices=STATUS_OPTIONS)
submit_date = DateTimeField(auto_now_add=True)
change_date = DateTimeField(auto_now=True)

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