如何在 Django 中将 UTC 时间转换为用户的本地时间？

Question

These answers didn't help:

1. Getting correct local time zone to display for end-users in Django web app

2. Django different timezones in same application

All datetime data is stored in UTC in my database.

I would like each of my users to see the datetime in their local timezone instead of UTC. I've tried the code below:

settings.py

TIME_ZONE = 'UTC'

USE_TZ = True

views.py

from django.shortcuts import render
from home_app import models
from django.utils import timezone
import pytz

def home_view(request):
    timezone.activate(pytz.timezone('Asia/Kolkata'))
    sample_queryset = models.TimeModel.objects.all()
    return render(request, 'home/home.html', {'sample_queryset': sample_queryset,})

home.html

{% for row in sample_queryset %}
    {% load tz %}
    {% localtime on %}
    {{ row.time }}
    {% endlocaltime %}
{% endfor %}

models.py

from django.db import models

class TimeModel(models.Model):
    sample_text = models.CharField(max_length=255)
    time = models.DateTimeField(auto_now=True)

    def __str__(self):
        return str(self.time) + ' ' + self.sample_text

However, after all, the same UTC time from the database is being printed.

Other details:

Django 1.11

SQLite (for now; will use Postgres in production)

Python 3.6.8

Answer 1

Valid timeZone values are based on the tz (timezone) database used by Linux and other Unix systems. The values are strings (xsd:string) in the form “ Area/Location ,” in which:

Area is a continent or ocean name. Area currently includes:

• Africa
• America (both North America and South America)
• Antarctica
• Arctic
• Asia
• Atlantic
• Australia
• Europe
• Etc (administrative zone. For example, “Etc/UTC” represents Coordinated Universal Time.)
• Indian
• Pacific

Location is the city, island, or other regional name.

The zone names and output abbreviations adhere to POSIX (portable operating system interface) UNIX conventions, which uses positive (+) signs west of Greenwich and negative (-) signs east of Greenwich, which is the opposite of what is generally expected. For example, “Etc/GMT+4” corresponds to 4 hours behind UTC (that is, west of Greenwich) rather than 4 hours ahead of UTC (Coordinated Universal Time) (east of Greenwich).

Here is a list all valid timezones

You can change time zone in your settings.py as follows

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'Asia/Kolkata'

USE_I18N = True

USE_L10N = True

USE_TZ = True

Answer 2

The issue looks in your template code, it should be something like

{% for row in sample_queryset %}
    {% load tz %}
    {% timezone timezone_string %}
    {{ row.time }}
    {% endtimezone %}

{% endfor %}

I suspect as per here localtime the timezone getting picked up for you is UTC from settings.py You should use this instead timezone

Answer 3

I have migrated to Postgres from SQLite and made the following changes:

models.py

Before:

from django.db import models

class TimeModel(models.Model):
    sample_text = models.CharField(max_length=255)
    time = models.DateTimeField(auto_now=True) # changed time to dt

    def __str__(self):
        return str(self.time) + ' ' + self.sample_text

After:

from django.db import models

class TimeModel(models.Model):
    sample_text = models.CharField(max_length=255)
    dt = models.DateTimeField(auto_now=True) # changed time to dt

    def __str__(self):
        return str(self.dt) + ' ' + self.sample_text