diff --git a/src/components/Discover/Map/Filter/Timeframes.vue b/src/components/Discover/Map/Filter/Timeframes.vue
index 0f4b37f..c25e865 100644
--- a/src/components/Discover/Map/Filter/Timeframes.vue
+++ b/src/components/Discover/Map/Filter/Timeframes.vue
@@ -250,11 +250,14 @@ export default{
     changeSelectArea(e) {
       // 日曆改變時，滑塊跟著改變
       let sliderData = this.sliderData;
-      this.startTime = new Date(sliderData[e[0]]);
-      this.endTime = new Date(sliderData[e[1]]);
+      let start = sliderData[e[0].toFixed()];
+      let end = sliderData[e[1].toFixed()]; // 取得 index，須為整數。
+
+      this.startTime = new Date(start);
+      this.endTime = new Date(end);
       // 重新設定 start end 日曆選取範圍
-      this.endMinDate = new Date(sliderData[e[0]]);
-      this.startMaxDate = new Date(sliderData[e[1]]);
+      this.endMinDate = new Date(start);
+      this.startMaxDate = new Date(end);
       // 重新算圖
       this.resizeMask(this.chart);
       // 執行 timeFrameStartEnd 才會改變數據