diff --git a/data/countries/NO.yaml b/data/countries/NO.yaml
index 3689e554f..831f69269 100644
--- a/data/countries/NO.yaml
+++ b/data/countries/NO.yaml
@@ -6,6 +6,7 @@ holidays:
   # @source https://www.timeanddate.com/holidays/norway/2023
   # @attrib https://no.wikipedia.org/wiki/Norges_offisielle_flaggdager
   # @attrib https://no.wikipedia.org/wiki/Allehelgensaften
+  # @attrib https://no.wikipedia.org/wiki/Advent
   NO:
     names:
       no: Norge
@@ -115,22 +116,22 @@ holidays:
       2nd sunday in November:
         _name: Fathers Day
         type: observance
-      4th sunday before 12-24:
+      4th sunday before 12-25:
         name:
           no: Første søndag i advent
           en: First Sunday of Advent
         type: observance
-      3rd sunday before 12-24:
+      3rd sunday before 12-25:
         name:
           no: Andre søndag i advent
           en: Second Sunday of Advent
         type: observance
-      2nd sunday before 12-24:
+      2nd sunday before 12-25:
         name:
           no: Tredje søndag i advent
           en: Third Sunday of Advent
         type: observance
-      1st sunday before 12-24:
+      1st sunday before 12-25:
         name:
           no: Fjerde søndag i advent
           en: Fourth Sunday of Advent
diff --git a/test/fixtures/NO-2015.json b/test/fixtures/NO-2015.json
index d02ed6687..daf4e0937 100644
--- a/test/fixtures/NO-2015.json
+++ b/test/fixtures/NO-2015.json
@@ -266,7 +266,7 @@
     "end": "2015-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2015-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2015-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2015-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2016.json b/test/fixtures/NO-2016.json
index 20caa407a..077823db1 100644
--- a/test/fixtures/NO-2016.json
+++ b/test/fixtures/NO-2016.json
@@ -266,7 +266,7 @@
     "end": "2016-11-27T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2016-12-04T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2016-12-11T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2016-12-18T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2017.json b/test/fixtures/NO-2017.json
index a5f52f128..6907e36dd 100644
--- a/test/fixtures/NO-2017.json
+++ b/test/fixtures/NO-2017.json
@@ -260,40 +260,40 @@
     "rule": "2nd sunday in November",
     "_weekday": "Sun"
   },
-  {
-    "date": "2017-11-26 00:00:00",
-    "start": "2017-11-25T23:00:00.000Z",
-    "end": "2017-11-26T23:00:00.000Z",
-    "name": "Første søndag i advent",
-    "type": "observance",
-    "rule": "4th sunday before 12-24",
-    "_weekday": "Sun"
-  },
   {
     "date": "2017-12-03 00:00:00",
     "start": "2017-12-02T23:00:00.000Z",
     "end": "2017-12-03T23:00:00.000Z",
-    "name": "Andre søndag i advent",
+    "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2017-12-10 00:00:00",
     "start": "2017-12-09T23:00:00.000Z",
     "end": "2017-12-10T23:00:00.000Z",
-    "name": "Tredje søndag i advent",
+    "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2017-12-17 00:00:00",
     "start": "2017-12-16T23:00:00.000Z",
     "end": "2017-12-17T23:00:00.000Z",
+    "name": "Tredje søndag i advent",
+    "type": "observance",
+    "rule": "2nd sunday before 12-25",
+    "_weekday": "Sun"
+  },
+  {
+    "date": "2017-12-24 00:00:00",
+    "start": "2017-12-23T23:00:00.000Z",
+    "end": "2017-12-24T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2018.json b/test/fixtures/NO-2018.json
index a6afd7e16..bab4168e6 100644
--- a/test/fixtures/NO-2018.json
+++ b/test/fixtures/NO-2018.json
@@ -266,7 +266,7 @@
     "end": "2018-12-02T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2018-12-09T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2018-12-16T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2018-12-23T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2019.json b/test/fixtures/NO-2019.json
index 30d25d0c4..c8a11bc96 100644
--- a/test/fixtures/NO-2019.json
+++ b/test/fixtures/NO-2019.json
@@ -266,7 +266,7 @@
     "end": "2019-12-01T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2019-12-08T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2019-12-15T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2019-12-22T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2020.json b/test/fixtures/NO-2020.json
index fb28d413c..152afdf6b 100644
--- a/test/fixtures/NO-2020.json
+++ b/test/fixtures/NO-2020.json
@@ -266,7 +266,7 @@
     "end": "2020-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2020-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2020-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2020-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2021.json b/test/fixtures/NO-2021.json
index a75438e1e..a0d844f5b 100644
--- a/test/fixtures/NO-2021.json
+++ b/test/fixtures/NO-2021.json
@@ -266,7 +266,7 @@
     "end": "2021-11-28T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2021-12-05T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2021-12-12T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2021-12-19T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2022.json b/test/fixtures/NO-2022.json
index bc0cdaefe..d11016f98 100644
--- a/test/fixtures/NO-2022.json
+++ b/test/fixtures/NO-2022.json
@@ -266,7 +266,7 @@
     "end": "2022-11-27T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2022-12-04T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2022-12-11T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2022-12-18T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2023.json b/test/fixtures/NO-2023.json
index 8932a8b49..069b5dad2 100644
--- a/test/fixtures/NO-2023.json
+++ b/test/fixtures/NO-2023.json
@@ -260,40 +260,40 @@
     "rule": "2nd sunday in November",
     "_weekday": "Sun"
   },
-  {
-    "date": "2023-11-26 00:00:00",
-    "start": "2023-11-25T23:00:00.000Z",
-    "end": "2023-11-26T23:00:00.000Z",
-    "name": "Første søndag i advent",
-    "type": "observance",
-    "rule": "4th sunday before 12-24",
-    "_weekday": "Sun"
-  },
   {
     "date": "2023-12-03 00:00:00",
     "start": "2023-12-02T23:00:00.000Z",
     "end": "2023-12-03T23:00:00.000Z",
-    "name": "Andre søndag i advent",
+    "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2023-12-10 00:00:00",
     "start": "2023-12-09T23:00:00.000Z",
     "end": "2023-12-10T23:00:00.000Z",
-    "name": "Tredje søndag i advent",
+    "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2023-12-17 00:00:00",
     "start": "2023-12-16T23:00:00.000Z",
     "end": "2023-12-17T23:00:00.000Z",
+    "name": "Tredje søndag i advent",
+    "type": "observance",
+    "rule": "2nd sunday before 12-25",
+    "_weekday": "Sun"
+  },
+  {
+    "date": "2023-12-24 00:00:00",
+    "start": "2023-12-23T23:00:00.000Z",
+    "end": "2023-12-24T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2024.json b/test/fixtures/NO-2024.json
index 22195ee45..4a8ba6977 100644
--- a/test/fixtures/NO-2024.json
+++ b/test/fixtures/NO-2024.json
@@ -266,7 +266,7 @@
     "end": "2024-12-01T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2024-12-08T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2024-12-15T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2024-12-22T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2025.json b/test/fixtures/NO-2025.json
index be0a89e96..4bf2916ba 100644
--- a/test/fixtures/NO-2025.json
+++ b/test/fixtures/NO-2025.json
@@ -266,7 +266,7 @@
     "end": "2025-11-30T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2025-12-07T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2025-12-14T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2025-12-21T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2026.json b/test/fixtures/NO-2026.json
index 67e6d89c0..2395416b3 100644
--- a/test/fixtures/NO-2026.json
+++ b/test/fixtures/NO-2026.json
@@ -266,7 +266,7 @@
     "end": "2026-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2026-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2026-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2026-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/NO-2027.json b/test/fixtures/NO-2027.json
index 71b88fbc8..4694f7566 100644
--- a/test/fixtures/NO-2027.json
+++ b/test/fixtures/NO-2027.json
@@ -266,7 +266,7 @@
     "end": "2027-11-28T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2027-12-05T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2027-12-12T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2027-12-19T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2015.json b/test/fixtures/SJ-2015.json
index d02ed6687..daf4e0937 100644
--- a/test/fixtures/SJ-2015.json
+++ b/test/fixtures/SJ-2015.json
@@ -266,7 +266,7 @@
     "end": "2015-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2015-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2015-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2015-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2016.json b/test/fixtures/SJ-2016.json
index 20caa407a..077823db1 100644
--- a/test/fixtures/SJ-2016.json
+++ b/test/fixtures/SJ-2016.json
@@ -266,7 +266,7 @@
     "end": "2016-11-27T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2016-12-04T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2016-12-11T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2016-12-18T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2017.json b/test/fixtures/SJ-2017.json
index a5f52f128..6907e36dd 100644
--- a/test/fixtures/SJ-2017.json
+++ b/test/fixtures/SJ-2017.json
@@ -260,40 +260,40 @@
     "rule": "2nd sunday in November",
     "_weekday": "Sun"
   },
-  {
-    "date": "2017-11-26 00:00:00",
-    "start": "2017-11-25T23:00:00.000Z",
-    "end": "2017-11-26T23:00:00.000Z",
-    "name": "Første søndag i advent",
-    "type": "observance",
-    "rule": "4th sunday before 12-24",
-    "_weekday": "Sun"
-  },
   {
     "date": "2017-12-03 00:00:00",
     "start": "2017-12-02T23:00:00.000Z",
     "end": "2017-12-03T23:00:00.000Z",
-    "name": "Andre søndag i advent",
+    "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2017-12-10 00:00:00",
     "start": "2017-12-09T23:00:00.000Z",
     "end": "2017-12-10T23:00:00.000Z",
-    "name": "Tredje søndag i advent",
+    "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2017-12-17 00:00:00",
     "start": "2017-12-16T23:00:00.000Z",
     "end": "2017-12-17T23:00:00.000Z",
+    "name": "Tredje søndag i advent",
+    "type": "observance",
+    "rule": "2nd sunday before 12-25",
+    "_weekday": "Sun"
+  },
+  {
+    "date": "2017-12-24 00:00:00",
+    "start": "2017-12-23T23:00:00.000Z",
+    "end": "2017-12-24T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2018.json b/test/fixtures/SJ-2018.json
index a6afd7e16..bab4168e6 100644
--- a/test/fixtures/SJ-2018.json
+++ b/test/fixtures/SJ-2018.json
@@ -266,7 +266,7 @@
     "end": "2018-12-02T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2018-12-09T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2018-12-16T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2018-12-23T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2019.json b/test/fixtures/SJ-2019.json
index 30d25d0c4..c8a11bc96 100644
--- a/test/fixtures/SJ-2019.json
+++ b/test/fixtures/SJ-2019.json
@@ -266,7 +266,7 @@
     "end": "2019-12-01T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2019-12-08T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2019-12-15T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2019-12-22T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2020.json b/test/fixtures/SJ-2020.json
index fb28d413c..152afdf6b 100644
--- a/test/fixtures/SJ-2020.json
+++ b/test/fixtures/SJ-2020.json
@@ -266,7 +266,7 @@
     "end": "2020-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2020-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2020-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2020-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2021.json b/test/fixtures/SJ-2021.json
index a75438e1e..a0d844f5b 100644
--- a/test/fixtures/SJ-2021.json
+++ b/test/fixtures/SJ-2021.json
@@ -266,7 +266,7 @@
     "end": "2021-11-28T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2021-12-05T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2021-12-12T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2021-12-19T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2022.json b/test/fixtures/SJ-2022.json
index bc0cdaefe..d11016f98 100644
--- a/test/fixtures/SJ-2022.json
+++ b/test/fixtures/SJ-2022.json
@@ -266,7 +266,7 @@
     "end": "2022-11-27T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2022-12-04T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2022-12-11T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2022-12-18T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2023.json b/test/fixtures/SJ-2023.json
index 8932a8b49..069b5dad2 100644
--- a/test/fixtures/SJ-2023.json
+++ b/test/fixtures/SJ-2023.json
@@ -260,40 +260,40 @@
     "rule": "2nd sunday in November",
     "_weekday": "Sun"
   },
-  {
-    "date": "2023-11-26 00:00:00",
-    "start": "2023-11-25T23:00:00.000Z",
-    "end": "2023-11-26T23:00:00.000Z",
-    "name": "Første søndag i advent",
-    "type": "observance",
-    "rule": "4th sunday before 12-24",
-    "_weekday": "Sun"
-  },
   {
     "date": "2023-12-03 00:00:00",
     "start": "2023-12-02T23:00:00.000Z",
     "end": "2023-12-03T23:00:00.000Z",
-    "name": "Andre søndag i advent",
+    "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2023-12-10 00:00:00",
     "start": "2023-12-09T23:00:00.000Z",
     "end": "2023-12-10T23:00:00.000Z",
-    "name": "Tredje søndag i advent",
+    "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
     "date": "2023-12-17 00:00:00",
     "start": "2023-12-16T23:00:00.000Z",
     "end": "2023-12-17T23:00:00.000Z",
+    "name": "Tredje søndag i advent",
+    "type": "observance",
+    "rule": "2nd sunday before 12-25",
+    "_weekday": "Sun"
+  },
+  {
+    "date": "2023-12-24 00:00:00",
+    "start": "2023-12-23T23:00:00.000Z",
+    "end": "2023-12-24T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2024.json b/test/fixtures/SJ-2024.json
index 22195ee45..4a8ba6977 100644
--- a/test/fixtures/SJ-2024.json
+++ b/test/fixtures/SJ-2024.json
@@ -266,7 +266,7 @@
     "end": "2024-12-01T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2024-12-08T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2024-12-15T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2024-12-22T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2025.json b/test/fixtures/SJ-2025.json
index be0a89e96..4bf2916ba 100644
--- a/test/fixtures/SJ-2025.json
+++ b/test/fixtures/SJ-2025.json
@@ -266,7 +266,7 @@
     "end": "2025-11-30T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2025-12-07T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2025-12-14T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2025-12-21T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2026.json b/test/fixtures/SJ-2026.json
index 67e6d89c0..2395416b3 100644
--- a/test/fixtures/SJ-2026.json
+++ b/test/fixtures/SJ-2026.json
@@ -266,7 +266,7 @@
     "end": "2026-11-29T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2026-12-06T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2026-12-13T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2026-12-20T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {
diff --git a/test/fixtures/SJ-2027.json b/test/fixtures/SJ-2027.json
index 71b88fbc8..4694f7566 100644
--- a/test/fixtures/SJ-2027.json
+++ b/test/fixtures/SJ-2027.json
@@ -266,7 +266,7 @@
     "end": "2027-11-28T23:00:00.000Z",
     "name": "Første søndag i advent",
     "type": "observance",
-    "rule": "4th sunday before 12-24",
+    "rule": "4th sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -275,7 +275,7 @@
     "end": "2027-12-05T23:00:00.000Z",
     "name": "Andre søndag i advent",
     "type": "observance",
-    "rule": "3rd sunday before 12-24",
+    "rule": "3rd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -284,7 +284,7 @@
     "end": "2027-12-12T23:00:00.000Z",
     "name": "Tredje søndag i advent",
     "type": "observance",
-    "rule": "2nd sunday before 12-24",
+    "rule": "2nd sunday before 12-25",
     "_weekday": "Sun"
   },
   {
@@ -293,7 +293,7 @@
     "end": "2027-12-19T23:00:00.000Z",
     "name": "Fjerde søndag i advent",
     "type": "observance",
-    "rule": "1st sunday before 12-24",
+    "rule": "1st sunday before 12-25",
     "_weekday": "Sun"
   },
   {