整数限制范围

from django.core.validators import MaxValueValidator, MinValueValidatorstart = models.IntegerField(verbose_name="开始",                                      validators=[                                            MaxValueValidator(24),                                            MinValueValidator(0)                                     ])

时间运算

from django.utils import timezonenow = timezone.datetime.now()#前一天start = now – timezone.timedelta(hours=24, minutes=0, seconds=0)