diff --git a/src/timespan.ts b/src/timespan.ts
new file mode 100644
index 0000000..be4515e
--- /dev/null
+++ b/src/timespan.ts
@@ -0,0 +1,32 @@
+export class TimeSpan {
+  private start: { hours: number; minutes: number };
+  private end: { hours: number; minutes: number };
+
+  constructor(timeSpanStr: string) {
+    const [startStr, endStr] = timeSpanStr.split("-");
+    this.start = this.parseTime(startStr);
+    this.end = this.parseTime(endStr);
+  }
+
+  private parseTime(timeStr: string) {
+    const [hours, minutes] = timeStr.split(":").map(Number);
+    return { hours, minutes };
+  }
+
+  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 startMinutes = this.start.hours * 60 + this.start.minutes;
+    const endMinutes = this.end.hours * 60 + this.end.minutes;
+
+    if (startMinutes > endMinutes) {
+      return currentMinutes >= startMinutes || currentMinutes < endMinutes;
+    } else {
+      return currentMinutes >= startMinutes && currentMinutes < endMinutes;
+    }
+  }
+}