您将需要两个不同的datetime阈值-today_start和today_end：
from datetime import datetime, timedelta, time
today = datetime.Now().date()
tomorrow = today + timedelta(1)
today_start = datetime.combine(today, time())
today_end = datetime.combine(tomorrow, time())
今天发生的所有事情都必须在 之前 开始today_end 在 之后 结束today_start，因此：
class EventManager(models.Manager):
def bookings_today(self, location_id):
# Construction of today_end / today_start as above, omitted for brevity
return self.filter(location=location_id, start__lte=today_end, end__gte=today_start)
（PS叫DateTimeField（非DateField）foo_date会令人误解，请考虑-start和end…）
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