diff --git a/app/controllers/stats_controller.rb b/app/controllers/stats_controller.rb
index eec5c5b2f..3d4e9e66d 100644
--- a/app/controllers/stats_controller.rb
+++ b/app/controllers/stats_controller.rb
@@ -141,7 +141,7 @@ class StatsController < ApplicationController
 
     association
       .where(date_attribute => min_date..max_date)
-      .group("DATE_TRUNC('month', #{date_attribute})")
+      .group("DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)")
       .count
       .to_a
       .sort_by { |a| a[0] }
@@ -152,7 +152,7 @@ class StatsController < ApplicationController
     sum = 0
     association
       .where("#{date_attribute} < ?", max_date)
-      .group("DATE_TRUNC('month', #{date_attribute})")
+      .group("DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)")
       .count
       .to_a
       .sort_by { |a| a[0] }
diff --git a/app/models/stat.rb b/app/models/stat.rb
index 37e1c131e..7e2068e3e 100644
--- a/app/models/stat.rb
+++ b/app/models/stat.rb
@@ -76,11 +76,11 @@ class Stat < ApplicationRecord
     end
 
     def last_four_months_hash(associations_with_date_attribute)
-      min_date = 3.months.ago.beginning_of_month.to_date
+      min_date = 3.months.ago.beginning_of_month
       timeseries = associations_with_date_attribute.map do |association, date_attribute|
         association
           .where(date_attribute => min_date..max_date)
-          .group("DATE_TRUNC('month', #{date_attribute})")
+          .group("DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)")
           .count
       end
 
@@ -94,7 +94,7 @@ class Stat < ApplicationRecord
       timeseries = associations_with_date_attribute.map do |association, date_attribute|
         association
           .where("#{date_attribute} < ?", max_date)
-          .group("DATE_TRUNC('month', #{date_attribute})")
+          .group("DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)")
           .count
       end
 
diff --git a/app/models/traitement.rb b/app/models/traitement.rb
index a407842d6..4975bbcc1 100644
--- a/app/models/traitement.rb
+++ b/app/models/traitement.rb
@@ -43,9 +43,9 @@ class Traitement < ApplicationRecord
       .to_sql
 
     sql = <<~EOF
-      select date_trunc('month', r1.processed_at) as month, count(r1.processed_at)
+      select date_trunc('month', r1.processed_at::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL) as month, count(r1.processed_at)
       from (#{last_traitements_per_dossier}) as r1
-      group by date_trunc('month', r1.processed_at)
+      group by date_trunc('month', r1.processed_at::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)
       order by month desc
     EOF
 
diff --git a/config/brakeman.ignore b/config/brakeman.ignore
index a21e71bf4..d1cd809da 100644
--- a/config/brakeman.ignore
+++ b/config/brakeman.ignore
@@ -31,6 +31,26 @@
       "confidence": "Weak",
       "note": "explicitely sanitized even if we are using html_safe"
     },
+    {
+      "warning_type": "SQL Injection",
+      "warning_code": 0,
+      "fingerprint": "4254ed68100af9b496883716b1fd658e1943b2385a0d08de5a6ef5c600c1a8f9",
+      "check_name": "SQL",
+      "message": "Possible SQL injection",
+      "file": "app/models/traitement.rb",
+      "line": 51,
+      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
+      "code": "ActiveRecord::Base.connection.execute(\"select date_trunc('month', r1.processed_at::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL) as month, count(r1.processed_at)\\nfrom (#{Traitement.select(\"max(traitements.processed_at) as processed_at\").termine.where(:dossier => Dossier.state_termine.where(:groupe_instructeur => groupe_instructeurs)).group(:dossier_id).to_sql}) as r1\\ngroup by date_trunc('month', r1.processed_at::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)\\norder by month desc\\n\")",
+      "render_path": null,
+      "location": {
+        "type": "method",
+        "class": "Traitement",
+        "method": "Traitement.count_dossiers_termines_by_month"
+      },
+      "user_input": "Time.zone.formatted_offset",
+      "confidence": "Medium",
+      "note": ""
+    },
     {
       "warning_type": "Cross-Site Scripting",
       "warning_code": 2,
@@ -62,26 +82,6 @@
       "confidence": "Weak",
       "note": ""
     },
-    {
-      "warning_type": "SQL Injection",
-      "warning_code": 0,
-      "fingerprint": "6c98e520dd368104bb0c81334875010711cd523afc28057ef86a10930f95c4b7",
-      "check_name": "SQL",
-      "message": "Possible SQL injection",
-      "file": "app/models/stat.rb",
-      "line": 83,
-      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
-      "code": "association.where(date_attribute => ((3.months.ago.beginning_of_month.to_date..max_date))).group(\"DATE_TRUNC('month', #{date_attribute})\")",
-      "render_path": null,
-      "location": {
-        "type": "method",
-        "class": "Stat",
-        "method": "last_four_months_hash"
-      },
-      "user_input": "date_attribute",
-      "confidence": "Weak",
-      "note": "no user input, fixed value"
-    },
     {
       "warning_type": "SQL Injection",
       "warning_code": 0,
@@ -102,6 +102,26 @@
       "confidence": "Medium",
       "note": "The table and column are escaped, which should make this safe"
     },
+    {
+      "warning_type": "SQL Injection",
+      "warning_code": 0,
+      "fingerprint": "c0f93612a68c32da58f327e0b5fa33dd42fd8beb2984cf023338c5aadbbdacca",
+      "check_name": "SQL",
+      "message": "Possible SQL injection",
+      "file": "app/models/stat.rb",
+      "line": 83,
+      "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
+      "code": "association.where(date_attribute => ((3.months.ago.beginning_of_month..max_date))).group(\"DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)\")",
+      "render_path": null,
+      "location": {
+        "type": "method",
+        "class": "Stat",
+        "method": "last_four_months_hash"
+      },
+      "user_input": "date_attribute",
+      "confidence": "Weak",
+      "note": ""
+    },
     {
       "warning_type": "Redirect",
       "warning_code": 18,
@@ -125,13 +145,13 @@
     {
       "warning_type": "SQL Injection",
       "warning_code": 0,
-      "fingerprint": "dc6d873aff3dc5e51e3349b17e1f35039b23d0bddbf04224b0f1bca3e4608c1e",
+      "fingerprint": "f2bb9bc6a56e44ab36ee18152c657395841cff354baed0a302b8d18650551529",
       "check_name": "SQL",
       "message": "Possible SQL injection",
       "file": "app/models/stat.rb",
       "line": 97,
       "link": "https://brakemanscanner.org/docs/warning_types/sql_injection/",
-      "code": "association.where(\"#{date_attribute} < ?\", max_date).group(\"DATE_TRUNC('month', #{date_attribute})\")",
+      "code": "association.where(\"#{date_attribute} < ?\", max_date).group(\"DATE_TRUNC('month', #{date_attribute}::TIMESTAMPTZ AT TIME ZONE '#{Time.zone.formatted_offset}'::INTERVAL)\")",
       "render_path": null,
       "location": {
         "type": "method",
@@ -140,9 +160,9 @@
       },
       "user_input": "date_attribute",
       "confidence": "Weak",
-      "note": "no user input, fixed value"
+      "note": ""
     }
   ],
-  "updated": "2021-12-13 17:09:07 +0100",
+  "updated": "2021-12-01 17:39:08 -1000",
   "brakeman_version": "5.1.1"
 }