add timezone to timespan

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;