diff --git a/lib/trainTimeFiltering.ts b/lib/trainTimeFiltering.ts
index 31f4256..c0bc05b 100644
--- a/lib/trainTimeFiltering.ts
+++ b/lib/trainTimeFiltering.ts
@@ -46,9 +46,16 @@ export const trainTimeFiltering: (x: trainDataProps) => boolean = (props) => {
     const delayData = currentTrain.filter((t) => t.num == d.train)[0].delay;
     let delay = delayData === "入線" ? 0 : delayData;
     const date = dayjs();
-    const IntH = parseInt(h) < 4 ? parseInt(h) + 24 : parseInt(h);
+    const IntH = parseInt(h);
     const IntM = parseInt(m);
-    const targetDate = date.hour(IntH).minute(IntM + delay);
+    const currentHour = date.hour();
+    
+    // 0時～4時未満は、現在時刻が4時以上の場合のみ翌日として扱う
+    let targetDate = date.clone().hour(IntH).minute(IntM + delay).second(0).millisecond(0);
+    if (IntH < 4 && currentHour >= 4) {
+      targetDate = targetDate.add(1, 'day');
+    }
+
     if (date.isAfter(targetDate)) return false;
     if (targetDate.diff(date) < baseTime * 60 * 60 * 1000) return true;
     return false;