diff --git a/.github/workflows/modoboa.yml b/.github/workflows/modoboa.yml
index 39d8be9ba..6c2a4c66a 100644
--- a/.github/workflows/modoboa.yml
+++ b/.github/workflows/modoboa.yml
@@ -97,7 +97,6 @@ jobs:
           pip install -r mysql-requirements.txt
           echo "DB=mysql" >> $GITHUB_ENV
       - name: Test with pytest
-        if: ${{ matrix.database != 'postgres' }}
         run: |
           python ./tests.py
           cd test_project
diff --git a/modoboa/dmarc/lib.py b/modoboa/dmarc/lib.py
index 9ae04c019..ee9e9aa63 100644
--- a/modoboa/dmarc/lib.py
+++ b/modoboa/dmarc/lib.py
@@ -14,7 +14,6 @@ import tldextract
 from defusedxml.ElementTree import fromstring
 from dns import resolver, reversename
 import magic
-import pytz.exceptions
 import six
 
 from django.db import transaction
@@ -128,11 +127,7 @@ def import_report(content):
                 print(f"Report skipped because of malformed data (empty {attr})")
                 return
         value = setattr(report, "policy_{}".format(attr), node.text)
-    try:
-        report.save()
-    except (pytz.exceptions.AmbiguousTimeError):
-        print("Report skipped because of invalid date.")
-        return
+    report.save()
     for record in root.findall("record"):
         import_record(record, report)
 
@@ -223,7 +218,7 @@ def week_range(year, weeknumber):
         "{}-{}-{}".format(year, weeknumber, 1), fmt)
     end_week = datetime.datetime.strptime(
         "{}-{}-{}".format(year, weeknumber, 0), fmt)
-    return tz.localize(start_week), tz.localize(end_week)
+    return start_week.replace(tzinfo=tz), end_week.replace(tzinfo=tz)
 
 
 def insert_record(target: dict, record, name: str) -> None:
diff --git a/modoboa/dmarc/views.py b/modoboa/dmarc/views.py
index 37c6ba8b4..45dad1161 100644
--- a/modoboa/dmarc/views.py
+++ b/modoboa/dmarc/views.py
@@ -45,7 +45,7 @@ def week_range(year, weeknumber):
         "{}-{}-{}".format(year, weeknumber, 1), fmt)
     end_week = datetime.datetime.strptime(
         "{}-{}-{}".format(year, weeknumber, 0), fmt)
-    return tz.localize(start_week), tz.localize(end_week)
+    return start_week.replace(tzinfo=tz), end_week.replace(tzinfo=tz)
 
 
 class DomainReportView(
diff --git a/modoboa/maillog/management/commands/logparser.py b/modoboa/maillog/management/commands/logparser.py
index 4a4380ff9..734722cfb 100644
--- a/modoboa/maillog/management/commands/logparser.py
+++ b/modoboa/maillog/management/commands/logparser.py
@@ -524,7 +524,7 @@ class LogParser:
         last_message = models.Maillog.objects.last()
         cur_dt = datetime.fromtimestamp(self.orig_ts)
         tz = timezone.get_current_timezone()
-        cur_dt = tz.localize(cur_dt)
+        cur_dt = cur_dt.replace(tzinfo=tz)
         condition = (
             last_message and (
                 cur_dt < last_message.date or