Validate time range

Author: timmo001

src/common/datetime/check_time.ts

@@ -24,6 +24,17 @@ const parseTimeString = (timeString: string, timezone: string): Date => {
     throw new Error(`Invalid time values in: ${timeString}`);
   }
 
+  // Add range validation
+  if (hours < 0 || hours > 23) {
+    throw new Error(`Invalid hours in: ${timeString}. Must be 0-23`);
+  }
+  if (minutes < 0 || minutes > 59) {
+    throw new Error(`Invalid minutes in: ${timeString}. Must be 0-59`);
+  }
+  if (seconds < 0 || seconds > 59) {
+    throw new Error(`Invalid seconds in: ${timeString}. Must be 0-59`);
+  }
+
   const now = new TZDate(new Date(), timezone);
   const dateWithTime = new TZDate(
     now.getFullYear(),