Upgrade django and other python dependencies

Upgrade django to 4.1
Upgrade django-timezone-field, django-simple-history, django-debug-toolbar and django-bootstrap-datepicker-plus
Upgrade mysqlclient
Remove obsolete pytz
Adapt timezone handling code to new interface of TimezoneInfo (part of python since 3.9 and backport included in 3.8)
Drop support for python 3.7 (since Django 4 requires >= 3.8)

AKModel/availability/forms.py

@@ -80,7 +80,7 @@ class AvailabilitiesFormMixin(forms.Form):
         if not obj:
             raise TypeError
         if obj.tzinfo is None:
-            obj = tz.localize(obj)
+            obj = obj.astimezone(tz)
 
         return obj
 

AKModel/forms.py

 import csv
 import io
 
-from bootstrap_datepicker_plus import DateTimePickerInput
+from bootstrap_datepicker_plus.widgets import DateTimePickerInput
 from django import forms
 from django.forms.utils import ErrorList
 from django.utils.translation import gettext_lazy as _

AKModel/migrations/0057_upgrades.py

+# Generated by Django 4.1.5 on 2023-01-03 17:04
+
+from django.db import migrations
+import timezone_field.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0056_remove_tags'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='event',
+            name='timezone',
+            field=timezone_field.fields.TimeZoneField(choices_display='WITH_GMT_OFFSET', default='Europe/Berlin', help_text='Time Zone where this event takes place in', verbose_name='Time Zone'),
+        ),
+    ]

AKModel/models.py

@@ -22,7 +22,7 @@ class Event(models.Model):
 
     place = models.CharField(max_length=128, blank=True, verbose_name=_('Place'),
                              help_text=_('City etc. the event takes place in'))
-    timezone = TimeZoneField(default='Europe/Berlin', display_GMT_offset=True, blank=False,
+    timezone = TimeZoneField(default='Europe/Berlin', blank=False, choices_display="WITH_GMT_OFFSET",
                              verbose_name=_('Time Zone'), help_text=_('Time Zone where this event takes place in'))
     start = models.DateTimeField(verbose_name=_('Start'), help_text=_('Time the event begins'))
     end = models.DateTimeField(verbose_name=_('End'), help_text=_('Time the event ends'))

AKModel/views.py

@@ -541,8 +541,8 @@ class DefaultSlotEditorView(EventSlugMixin, IntermediateAdminView):
         previous_slot_ids = set(s.id for s in self.event.defaultslot_set.all())
 
         for slot in default_slots_raw:
-            start = tz.localize(parse_datetime(slot["start"]))
-            end = tz.localize(parse_datetime(slot["end"]))
+            start = parse_datetime(slot["start"]).astimezone(tz)
+            end = parse_datetime(slot["end"]).astimezone(tz)
 
             if slot["id"] != '':
                 id = int(slot["id"])

INSTALL.md

@@ -10,7 +10,7 @@ setup.
 
 ### System Requirements
 
-* Python 3.7 incl. development tools
+* Python 3.8+ incl. development tools
 * Virtualenv
 * pdflatex & beamer
   class (`texlive-latex-base texlive-latex-recommended texlive-latex-extra texlive-fonts-extra texlive-luatex`)

requirements.txt

-Django==3.2.16
+Django==4.1.5
 django-bootstrap5==22.2
 fontawesomefree==6.2.1 # Makes static files (css, fonts) available locally
 django-fontawesome-6==1.0.0.0 # Provides an icon field for models and forms as well as handy shortcuts to render icons
 django-split-settings==1.2.0
-django-timezone-field==4.1.2
+django-timezone-field==5.0
 djangorestframework==3.14.0
-django-simple-history==3.1.1
+django-simple-history==3.2.0
 django-registration-redux==2.11
-django-debug-toolbar==3.7.0
-django-bootstrap-datepicker-plus==3.0.5
+django-debug-toolbar==3.8.1
+django-bootstrap-datepicker-plus==5.0.2
 django-tex==1.1.10
 django-csp==3.7
-mysqlclient==2.0.3  # for production deployment
-pytz==2022.4
+mysqlclient==2.1.1  # for production deployment
+tzdata==2022.7