diff --git a/static/chart_main/sevencoin.js b/static/chart_main/sevencoin.js
index 7c325ac..5091aaf 100644
--- a/static/chart_main/sevencoin.js
+++ b/static/chart_main/sevencoin.js
@@ -290,18 +290,18 @@ $(function () {
 			}
 			// 创建新的日期对象，并使用调整后的时间戳
 			const adjustedDate = new Date(timestamp);
-			
+					
 			// 返回调整后的日期对象
 			return adjustedDate;
 		}
 		// 判断日期是否在夏令时（简化的逻辑，实际应用中需要考虑更多的边界情况）
 		dateIsInEDT(date) {
 		    const year = date.getUTCFullYear();
-		    const start = new Date(Date.UTC(year, 2, 13, 18)); // March, 2nd Sunday
-		    const end = new Date(Date.UTC(year, 10, 6, 18)); // November, 1st Sunday
-		    
+		    const start = new Date(Date.UTC(year, 2, 8, 18)); // March, 2nd Sunday
+		    const end = new Date(Date.UTC(year, 10, 3, 18)); // November, 1st Sunday
 		    start.setUTCDate(14 - start.getUTCDay());
 		    end.setUTCDate(7 - end.getUTCDay());
+		
 		    return date >= start && date < end;
 		}