Django filter events occurring today

Question

I’m struggling to logically represent the following in a Django filter. I have an ‘event’ model, and a location model, which can be represented as:

class Location(models.Model):
    name = models.CharField(max_length=255)

class Event(models.Model):
    start_date = models.DateTimeField()
    end_date = models.DateTimeField()
    location = models.ForeignKeyField(Location)

    objects = EventManager()

For a given location, I want to select all events occurring today. I’ve tried various strategies via a ‘bookings_today’ method in the EventManager, but the right filter syntax eludes me:

class EventManager(models.Manager):
    def bookings_today(self, location_id):
        bookings = self.filter(location=location_id, start=?, end=?)

date() fails as this zeroes out the times, and time during the day is critical to the app, the same goes for min and max of the dates, and using them as bookends. In addition, there are multiple possible valid configurations:

start_date < today, end_date during today
start_date during today, end_date during today
start_date during today, end_date after today

Do I need to code a whole set of different options or is there a more simple and elegant method?

Asked By: jvc26

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Source

Answer 1

How about this: pub_date__gte=datetime(2005, 1, 1)? Use _gte and __lte to limit start and end within one day using chaining method.

Maybe something like self.filter(start__gte=datetime(2005, 1, 1)).filter(end__lte=datetime(2005, 1, 1)). lte stands for less or equal than, gte stands for greater or equal than.

I find it in django doc.

Answered By: Yulong

Answer 2

You need to use a range there like this:

class EventManager(models.Manager):
    def bookings_today(self, location_id):
        from datetime import datetime
        now = datetime.now()
        bookings = self.filter(location=location_id, start__lte=now, end__gte=now)
        return bookings

Answered By: Aidas Bendoraitis

Answer 3

I think exclude is your friend here!

today = datetime.date.today()
tomorrow = today + datetime.timedelta( days = 1 )
self.filter( location = location_id ).exclude( end_date__lt = today ).exclude( start_date__gte = tomorrow )

Answered By: Steven

Answer 4

You’ll need two distinct datetime thresholds – today_start and 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())

Anything happening today must have started before today_end and ended after today_start, so:

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)

(P.S. Having a DateTimeField (not a DateField) called foo_date is irritatingly misleading – consider just start and end…)

Answered By: Kristian Glass

Answer 5

None of the answers I saw is timezone aware.

Why don’t you just do this instead:

from django.utils import timezone

class EventManager(models.Manager):
    def bookings_today(self, location_id):
        bookings = self.filter(location=location_id, start__gte=timezone.now().replace(hour=0, minute=0, second=0), end__lte=timezone.now().replace(hour=23, minute=59, second=59))

Answered By: Anthony Anyanwu

Answer 6

timezone.localtime(timezone.now()).date() gets you the correct date.

To get events occurring today(start today):

from django.utils import timezone

class EventManager(models.Manager):
    def bookings_today(self, location_id):
        t = timezone.localtime(timezone.now())
        bookings = self.filter(location=location_id, start__year = t.year,
            start__month = t.month, start__day = t.day, )

Answered By: suhailvs

Answer 7

i have a suggestion

class Car:
      name = models.CharField()
      launched_date = models.DateTimeField()

it is very difficult to filter datetime field by todays date .
even if you take timezone.now() – you will not get correct output.
becuase timezone.now() has time also.

datetime field has time along with it , so even if you are giving correct date the time will not be matching.

so

it is better to use datefield for filtering based on date

class Car:
      name = models.CharField()
      launched_date = models.DateField()

answer for the question :-

   from django.utils.timezone import datetime 
    today = datetime.today()
    events_for_today = Event.objects.filter(start_date__year=today.year,
                        start_date__month=today.month,
                         start_date__day=today.day)

Answered By: Sarath Chandran K

Answer 8

because it is a DateTimeField use start_date__date

today = datetime.now().date()

leave = Event.objects.filter(start_date__date=today)

Answered By: Immanuel

Answer 9

As it is a DateTimeField use start_date__date and perform an OR (|) query

from django.db.models import Q
from django.utils import timezone

today = timezone.now().date()
qs = Event.objects.filter(
    Q(start_date__date=today) |
    Q(end_date__date=today)
)

Answered By: slamora

Django filter events occurring today

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