feat(settings): Drop time_zone

Author: kiblik

docs/content/en/open_source/upgrading/2.50.md

@@ -2,6 +2,10 @@
 title: 'Upgrading to DefectDojo Version 2.50.x'
 toc_hide: true
 weight: -20250804
-description: No special instructions.
+description: Dropped support for time_zone in System settings.
 ---
-There are no special instructions for upgrading to 2.50.x. Check the [Release Notes](https://github.com/DefectDojo/django-DefectDojo/releases/tag/2.50.0) for the contents of the release.
+
+To simplify the management of the DefectDojo application, it is not necessary to set the time zone in two places (environmental variables and system settings). From now on, environmental variable is supported.
+Please check that the environmental variable `DD_TIME_ZONE` is set based on your satisfaction. Any [TZ identifier](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones) is a valid value. Default value is `UTC`.
+
+There are other instructions for upgrading to 2.50.x. Check the [Release Notes](https://github.com/DefectDojo/django-DefectDojo/releases/tag/2.50.0) for the contents of the release.

dojo/db_migrations/0241_remove_system_settings_time_zone.py

@@ -0,0 +1,15 @@
+# Generated by Django 5.1.11 on 2025-08-15 16:30
+from django.db import migrations
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('dojo', '0240_jira_instance_password_help_text_fix'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='system_settings',
+            name='time_zone',
+       ),
+    ]

dojo/filters.py

@@ -2,7 +2,6 @@
 import decimal
 import logging
 import warnings
-import zoneinfo
 from datetime import datetime, timedelta
 
 import six
@@ -14,7 +13,7 @@
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import Count, JSONField, Q
 from django.forms import HiddenInput
-from django.utils import timezone
+from django.utils.timezone import now, tzinfo
 from django.utils.translation import gettext_lazy as _
 from django_filters import (
     BooleanFilter,
@@ -97,8 +96,6 @@
 
 logger = logging.getLogger(__name__)
 
-local_tz = zoneinfo.ZoneInfo(get_system_setting("time_zone"))
-
 BOOLEAN_CHOICES = (("false", "No"), ("true", "Yes"))
 EARLIEST_FINDING = None
 
@@ -124,10 +121,6 @@ def vulnerability_id_filter(queryset, name, value):
     return queryset.filter(id__in=ids)
 
 
-def now():
-    return datetime.today().replace(tzinfo=local_tz)
-
-
 class NumberInFilter(filters.BaseInFilter, filters.NumberFilter):
     pass
 
@@ -200,7 +193,7 @@ def filter(self, qs, value):
         earliest_finding = get_earliest_finding(qs)
         if earliest_finding is not None:
             start_date = datetime.combine(
-                earliest_finding.date, datetime.min.time()).replace(tzinfo=local_tz)
+                earliest_finding.date, datetime.min.time()).replace(tzinfo=tzinfo())
             self.start_date = _truncate(start_date - timedelta(days=1))
             self.end_date = _truncate(now() + timedelta(days=1))
         try:
@@ -216,7 +209,7 @@ def any(self, qs, name):
 
     def sla_satisfied(self, qs, name):
         # return findings that have an sla expiration date after today or no sla expiration date
-        return qs.filter(Q(sla_expiration_date__isnull=True) | Q(sla_expiration_date__gt=timezone.now().date()))
+        return qs.filter(Q(sla_expiration_date__isnull=True) | Q(sla_expiration_date__gt=now().date()))
 
     def sla_violated(self, qs, name):
         # return active findings that have an sla expiration date before today
@@ -229,7 +222,7 @@ def sla_violated(self, qs, name):
                 risk_accepted=False,
                 is_mitigated=False,
                 mitigated=None,
-            ) & Q(sla_expiration_date__lt=timezone.now().date()),
+            ) & Q(sla_expiration_date__lt=now().date()),
         )
 
     options = {
@@ -824,22 +817,22 @@ def any(self, qs, name):
         earliest_finding = get_earliest_finding(qs)
         if earliest_finding is not None:
             start_date = datetime.combine(
-                earliest_finding.date, datetime.min.time()).replace(tzinfo=local_tz)
+                earliest_finding.date, datetime.min.time()).replace(tzinfo=tzinfo())
             self.start_date = _truncate(start_date - timedelta(days=1))
             self.end_date = _truncate(now() + timedelta(days=1))
             return qs.all()
         return None
 
     def current_month(self, qs, name):
-        self.start_date = datetime(now().year, now().month, 1, 0, 0, 0).replace(tzinfo=local_tz)
+        self.start_date = datetime(now().year, now().month, 1, 0, 0, 0).replace(tzinfo=tzinfo())
         self.end_date = now()
         return qs.filter(**{
             f"{name}__year": self.start_date.year,
             f"{name}__month": self.start_date.month,
         })
 
     def current_year(self, qs, name):
-        self.start_date = datetime(now().year, 1, 1, 0, 0, 0).replace(tzinfo=local_tz)
+        self.start_date = datetime(now().year, 1, 1, 0, 0, 0).replace(tzinfo=tzinfo())
         self.end_date = now()
         return qs.filter(**{
             f"{name}__year": now().year,
@@ -890,7 +883,7 @@ def filter(self, qs, value):
         earliest_finding = get_earliest_finding(qs)
         if earliest_finding is not None:
             start_date = datetime.combine(
-                earliest_finding.date, datetime.min.time()).replace(tzinfo=local_tz)
+                earliest_finding.date, datetime.min.time()).replace(tzinfo=tzinfo())
             self.start_date = _truncate(start_date - timedelta(days=1))
             self.end_date = _truncate(now() + timedelta(days=1))
         try:

dojo/models.py

@@ -4,7 +4,6 @@
 import logging
 import re
 import warnings
-import zoneinfo
 from contextlib import suppress
 from datetime import datetime, timedelta
 from decimal import Decimal
@@ -437,9 +436,6 @@ class System_Settings(models.Model):
 
     url_prefix = models.CharField(max_length=300, default="", blank=True, help_text=_("URL prefix if DefectDojo is installed in it's own virtual subdirectory."))
     team_name = models.CharField(max_length=100, default="", blank=True)
-    time_zone = models.CharField(max_length=50,
-                                 choices=[(tz, tz) for tz in zoneinfo.available_timezones()],
-                                 default="UTC", blank=False)
     enable_product_grade = models.BooleanField(default=False, verbose_name=_("Enable Product Grading"), help_text=_("Displays a grade letter next to a product to show the overall health."))
     product_grade = models.CharField(max_length=800, blank=True)
     product_grade_a = models.IntegerField(default=90,