Lookup hour on DateTimeField Django

问题

I have the model

class Item(models.Model):
    inicio = models.DateTimeField()

When I try to make this query:

itens = Item.objects.filter(inicio__hour__gte=6)

It returns me:

FieldError Unsupported lookup 'hour' for DateTimeField or join on the field not permitted.

How can I make this query?

回答1:

You need to filter using a timedelta:

from datetime import datetime, timedelta

five_hours_ago = datetime.now() - timedelta(hours=5)
items = Item.objects.filter(inicio__lt=five_hours_ago)

You can always specify an exact datetime and then subtract 5 hours from it if you don't want 5 hours from the current datetime.

To the best of my knowledge, and according to the documentation, you can only do an exact lookup on an hour, minute or second.

回答2:

Heads up, this should work as of Django 1.9

Event.objects.filter(timestamp__hour=23)
Event.objects.filter(time__hour=5)
Event.objects.filter(timestamp__hour__gte=12)

来源：https://stackoverflow.com/questions/26267985/lookup-hour-on-datetimefield-django