diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbe8942..1fb222b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [2.3.1] - 2026-02-04
+
+### Updated
+
+- Updated functions of the `DateFormatter` to a newer version
+
 ## [2.3.0] - 2026-02-04
 
 ### Added
diff --git a/package.json b/package.json
index b90ec49..f3ee616 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "2.3.0",
+  "version": "2.3.1",
   "license": "MIT",
   "private": false,
   "engines": {
diff --git a/src/util/PatternCompiler/Plugin/DateFormatter.ts b/src/util/PatternCompiler/Plugin/DateFormatter.ts
index b91f404..087527d 100644
--- a/src/util/PatternCompiler/Plugin/DateFormatter.ts
+++ b/src/util/PatternCompiler/Plugin/DateFormatter.ts
@@ -81,11 +81,12 @@ export class DateFormatter {
   static getZoneAdjustedWeekday = (
     dateString: string,
     options: {
-      timezone: string;
+      timezone: string | undefined;
       locale: string | undefined;
-    }
+    },
+    defaultTimeZone: string = 'Europe/Berlin'
   ) => {
-    const timezone = options.timezone;
+    const timezone = options.timezone ?? defaultTimeZone;
 
     return new Date(dateString).toLocaleDateString(options.locale, {
       weekday: 'long',
@@ -96,11 +97,12 @@ export class DateFormatter {
   static getZoneAdjustedDate = (
     dateString: string,
     options: {
-      timezone: string;
+      timezone: string | undefined;
       locale: string | undefined;
-    }
+    },
+    defaultTimeZone: string = 'Europe/Berlin'
   ) => {
-    const timezone = options.timezone;
+    const timezone = options.timezone ?? defaultTimeZone;
 
     return new Date(dateString).toLocaleDateString(options.locale, {
       month: 'long',
@@ -112,11 +114,12 @@ export class DateFormatter {
   static getZoneAdjustedTime = (
     dateString: string,
     options: {
-      timezone: string;
+      timezone: string | undefined;
       locale: string | undefined;
-    }
+    },
+    defaultTimeZone: string = 'Europe/Berlin'
   ) => {
-    const timezone = options.timezone;
+    const timezone = options.timezone ?? defaultTimeZone;
 
     return new Date(dateString)
       .toLocaleTimeString(options.locale, {