diff --git a/dist/timehelper.d.ts b/dist/timehelper.d.ts
index 4dca049..9cdc507 100644
--- a/dist/timehelper.d.ts
+++ b/dist/timehelper.d.ts
@@ -1,7 +1,8 @@
 export declare class TimeSpan {
     private start;
     private end;
-    constructor(timeSpanStr: string);
+    private timeZone;
+    constructor(timeSpanStr: string, timeZone: string);
     private parseTime;
     contains(timestamp?: number): boolean;
 }
diff --git a/dist/timehelper.d.ts.map b/dist/timehelper.d.ts.map
index 00c1cdd..c924317 100644
--- a/dist/timehelper.d.ts.map
+++ b/dist/timehelper.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"timehelper.d.ts","sourceRoot":"","sources":["../src/timehelper.ts"],"names":[],"mappings":"AAAA,qBAAa,QAAQ;IACnB,OAAO,CAAC,KAAK,CAAqC;IAClD,OAAO,CAAC,GAAG,CAAqC;gBAEpC,WAAW,EAAE,MAAM;IAM/B,OAAO,CAAC,SAAS;IAKjB,QAAQ,CAAC,SAAS,GAAE,MAAmB,GAAG,OAAO;CAgBlD;AAED,MAAM,WAAW,WAAW;IAC1B,OAAO,EAAE,MAAM,CAAC;IAChB,UAAU,EAAE,CAAC,cAAc,CAAC,EAAE,OAAO,KAAK,MAAM,CAAC;CAClD;AAED,wBAAgB,uBAAuB,CACrC,KAAK,EAAE,MAAM,EACb,GAAG,EAAE,MAAM,GACV,WAAW,CAOb;AAED,wBAAgB,iBAAiB,CAC/B,IAAI,EAAE,MAAM,EACZ,cAAc,GAAE,OAAe,GAC9B,MAAM,CAmBR"}
\ No newline at end of file
+{"version":3,"file":"timehelper.d.ts","sourceRoot":"","sources":["../src/timehelper.ts"],"names":[],"mappings":"AAAA,qBAAa,QAAQ;IACnB,OAAO,CAAC,KAAK,CAAqC;IAClD,OAAO,CAAC,GAAG,CAAqC;IAChD,OAAO,CAAC,QAAQ,CAAC;gBAEL,WAAW,EAAE,MAAM,EAAE,QAAQ,EAAE,MAAM;IAOjD,OAAO,CAAC,SAAS;IAKjB,QAAQ,CAAC,SAAS,GAAE,MAAmB,GAAG,OAAO;CAqBlD;AAED,MAAM,WAAW,WAAW;IAC1B,OAAO,EAAE,MAAM,CAAC;IAChB,UAAU,EAAE,CAAC,cAAc,CAAC,EAAE,OAAO,KAAK,MAAM,CAAC;CAClD;AAED,wBAAgB,uBAAuB,CACrC,KAAK,EAAE,MAAM,EACb,GAAG,EAAE,MAAM,GACV,WAAW,CAOb;AAED,wBAAgB,iBAAiB,CAC/B,IAAI,EAAE,MAAM,EACZ,cAAc,GAAE,OAAe,GAC9B,MAAM,CAmBR"}
\ No newline at end of file
diff --git a/dist/timehelper.js b/dist/timehelper.js
index 0ef369b..149081c 100644
--- a/dist/timehelper.js
+++ b/dist/timehelper.js
@@ -1,10 +1,12 @@
 export class TimeSpan {
     start;
     end;
-    constructor(timeSpanStr) {
+    timeZone;
+    constructor(timeSpanStr, timeZone) {
         const [startStr, endStr] = timeSpanStr.split("-");
         this.start = this.parseTime(startStr);
         this.end = this.parseTime(endStr);
+        this.timeZone = timeZone;
     }
     parseTime(timeStr) {
         const [hours, minutes] = timeStr.split(":").map(Number);
@@ -12,8 +14,13 @@ export class TimeSpan {
     }
     contains(timestamp = Date.now()) {
         const date = new Date(timestamp);
-        const hours = date.getHours();
-        const minutes = date.getMinutes();
+        const berlinTimeStr = date.toLocaleString("de-DE", {
+            timeZone: this.timeZone, // "Europe/Berlin"
+            hour12: false,
+            hour: "2-digit",
+            minute: "2-digit",
+        });
+        const [hours, minutes] = berlinTimeStr.split(":").map(Number);
         const currentMinutes = hours * 60 + minutes;
         const startMinutes = this.start.hours * 60 + this.start.minutes;
         const endMinutes = this.end.hours * 60 + this.end.minutes;
diff --git a/src/timehelper.ts b/src/timehelper.ts
index e1729b8..a50d625 100644
--- a/src/timehelper.ts
+++ b/src/timehelper.ts
@@ -1,11 +1,13 @@
 export class TimeSpan {
   private start: { hours: number; minutes: number };
   private end: { hours: number; minutes: number };
+  private timeZone;
 
-  constructor(timeSpanStr: string) {
+  constructor(timeSpanStr: string, timeZone: string) {
     const [startStr, endStr] = timeSpanStr.split("-");
     this.start = this.parseTime(startStr);
     this.end = this.parseTime(endStr);
+    this.timeZone = timeZone;
   }
 
   private parseTime(timeStr: string) {
@@ -16,10 +18,15 @@ export class TimeSpan {
   contains(timestamp: number = Date.now()): boolean {
     const date = new Date(timestamp);
 
-    const hours = date.getHours();
-    const minutes = date.getMinutes();
-    const currentMinutes = hours * 60 + minutes;
+    const berlinTimeStr = date.toLocaleString("de-DE", {
+      timeZone: this.timeZone, // "Europe/Berlin"
+      hour12: false,
+      hour: "2-digit",
+      minute: "2-digit",
+    });
 
+    const [hours, minutes] = berlinTimeStr.split(":").map(Number);
+    const currentMinutes = hours * 60 + minutes;
     const startMinutes = this.start.hours * 60 + this.start.minutes;
     const endMinutes = this.end.hours * 60 + this.end.minutes;