Timestamp fields in django

django datetimefield
django datetimefield format
django foreign key
django model
django timestamp to datetime
django model choice field
django get timestamp
manytomanyfield django

I have a MySQL database, right now I'm generating all of the datetime fields as models.DateTimeField. Is there a way to get a timestamp instead? I want to be able to autoupdate on create and update etc.

The documentation on django doesn't have this?

There was actually a very good and informative article on this. Here: http://ianrolfe.livejournal.com/36017.html

The solution on the page is slightly deprecated, so I did the following:

from django.db import models
from datetime import datetime
from time import strftime

class UnixTimestampField(models.DateTimeField):
    """UnixTimestampField: creates a DateTimeField that is represented on the
    database as a TIMESTAMP field rather than the usual DATETIME field.
    """
    def __init__(self, null=False, blank=False, **kwargs):
        super(UnixTimestampField, self).__init__(**kwargs)
        # default for TIMESTAMP is NOT NULL unlike most fields, so we have to
        # cheat a little:
        self.blank, self.isnull = blank, null
        self.null = True # To prevent the framework from shoving in "not null".

    def db_type(self, connection):
        typ=['TIMESTAMP']
        # See above!
        if self.isnull:
            typ += ['NULL']
        if self.auto_created:
            typ += ['default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP']
        return ' '.join(typ)

    def to_python(self, value):
        if isinstance(value, int):
            return datetime.fromtimestamp(value)
        else:
            return models.DateTimeField.to_python(self, value)

    def get_db_prep_value(self, value, connection, prepared=False):
        if value==None:
            return None
        # Use '%Y%m%d%H%M%S' for MySQL < 4.1
        return strftime('%Y-%m-%d %H:%M:%S',value.timetuple())

To use it, all you have to do is: timestamp = UnixTimestampField(auto_created=True)

In MySQL, the column should appear as: 'timestamp' timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

Only drawback with this is that it only works on MySQL databases. But you can easily modify it for others.

In django do models have a default timestamp field?, No such thing by default, but adding one is super-easy. Just use the auto_now_add parameter in the DateTimeField class: created = models. When saving timestamp in Django's DateTimeField using auto_now_add this way: creation_timestamp = models.DateTimeField(auto_now_add=True) the field is saved with miliseconds: 2018-11-20T15:58:44.767594-06:00 I want to format this to be displayed without miliseconds: 2018-11-20T15:58:44-06:00

To automatically update on insert and update use this:

created = DateTimeField(auto_now_add=True, editable=False, null=False, blank=False)
last_modified = DateTimeField(auto_now=True, editable=False, null=False, blank=False)

The DateTimeField should store UTC (check your DB settings, I know from Postgres that there it is the case). You can use l10n in the templates and format via:

{{ object.created|date:'SHORT_DATETIME_FORMAT' }}

Seconds since Unix Epoch:

{{ object.created|date:'U' }}

See https://docs.djangoproject.com/en/1.10/ref/templates/builtins/#date

Model field reference | Django documentation, Django Unix timestamp (POSIX type) field. pip install django- unixtimestampfield from django.db import models from unixtimestampfield. fields import� If True, Django will store empty values as NULL in the database. Default is False. Blank: If True, the field is allowed to be blank. Default is False. db_column: The name of the database column to use for this field. If this isn’t given, Django will use the field’s name. Default: The default value for the field. This can be a value or a

The pip package django-unixdatetimefield provides a UnixDateTimeField field that you can use for this out of the box (https://pypi.python.org/pypi/django-unixdatetimefield/).

Example model:

from django_unixdatetimefield import UnixDateTimeField

class MyModel(models.Model):
    created_at = UnixDateTimeField()

Python ORM query:

>>> m = MyModel()
>>> m.created_at = datetime.datetime(2015, 2, 21, 19, 38, 32, 209148)
>>> m.save()

Database:

sqlite> select created_at from mymodel;
1426967129

Here's the source code if interested - https://github.com/Niklas9/django-unixdatetimefield.

Disclaimer: I'm the author of this pip package.

django-unixtimestampfield � PyPI, These fields are built into Django for expressly this purpose — auto_now fields are updated to the current timestamp every time an object is� from django.db import models from datetime import datetime from time import strftime class UnixTimestampField(models.DateTimeField): """UnixTimestampField: creates a DateTimeField that is represented on the database as a TIMESTAMP field rather than the usual DATETIME field.

django-extensions has a useful TimeStampedModel: https://django-extensions.readthedocs.io/en/latest/model_extensions.html

Django's auto_now and auto_now_add fields for auditing creation , If None , then DateTimeField serializer fields will return Python datetime objects, and the datetime encoding will be determined by the renderer. So even if you set a value for this field when creating the object, it will be ignored. If you want to be able to modify this field, set the following instead of auto_now_add=True: For DateField: default=date.today – from datetime.date.today() For DateTimeField: default=timezone.now – from django.utils.timezone.now()

Django REST Framework — Convert DateTime into timestamp , In this article, we show how to create a timestamp and last updated database fields in Django that stores the time (to the minute) when a field was submitted and� Field is an abstract class that represents a database table column. Django uses fields to create the database table (db_type()), to map Python types to database (get_prep_value()) and vice-versa (from_db_value()). A field is thus a fundamental piece in different Django APIs, notably, models and querysets.

How to Create a Timestamp and Last Updated Database Table , In Django, fields with auto_now=True are not always updated correctly. A common practice to work around this is to override the save() method� Each field in your model should be an instance of the appropriate Field class. Django uses the field class types to determine a few things: The column type, which tells the database what kind of data to store (e.g. INTEGER, VARCHAR, TEXT). The default HTML widget to use when rendering a form field (e.g. <input type="text">, <select>).

Auto-updated timestamp fields in Django bulk querysets., auto_now. Automatically set the field to now every time the object is saved. Useful for “last-modified” timestamps. Note that the current date is� readonly_fields. Sets the listed form fields to read-only. Very handy for timestamp fields and other fields you want visible, but not editable. Managing Users in the Admin. If you remember from the beginning of the chapter, Django’s built-in authentication system is added to the admin interface when you create a new project. With the admin

Comments
  • The get_db_prep_value function is out of date, as it only applies to TIMESTAMP columns on MySQL < 4.1. For modern versions of MySQL use '%Y-%m-%d %H:%M:%S' instead of '%Y%m%d%H%M%S'.
  • For django 1.8 you should implement from_db_value to convert the database value to your object's attribute.
  • does it have options for NULL etc?
  • it does, it subclasses the standard DateTimeField in Django, which in turn supports NULL etc. See code line 8 at - github.com/Niklas9/django-unixdatetimefield/blob/master/…
  • I am trying to insert data from Django Rest Framework, and when I send the payload: { "timeStamp": 1581950810, } I get this error: { "timeStamp": [ "Datetime has wrong format. Use one of these formats instead: YYYY-MM-DDThh:mm[:ss[.uuuuuu]][+HH:MM|-HH:MM|Z]." ] } Is it possible to accept timestamp on the field?
  • You're using it the wrong way. If you need to send unix timestamps to your API, you should use Django Rest Framework to handle it, no need to use this library.