diff --git a/backend/src/main/java/com/goldenchart/service/BacktestingService.java b/backend/src/main/java/com/goldenchart/service/BacktestingService.java
index 4dc714c..919b9aa 100644
--- a/backend/src/main/java/com/goldenchart/service/BacktestingService.java
+++ b/backend/src/main/java/com/goldenchart/service/BacktestingService.java
@@ -181,7 +181,7 @@ public class BacktestingService {
         for (int i = 0; i < barCount; i++) {
             double closePrice = getPrice(series, req.getBars(), i, cfg.getEntryPriceType());
             double exitPrice  = getPrice(series, req.getBars(), i, cfg.getExitPriceType());
-            long   time       = series.getBar(i).getEndTime().getEpochSecond();
+            long   time       = barStartEpoch(series, i);
 
             // ── SIGNAL_ONLY 모드: 포지션·자금 상태 무관, 조건 충족 시마다 전체 시그널 생성 ──
             if (signalOnly) {
@@ -458,6 +458,12 @@ public class BacktestingService {
                 .build();
     }
 
+    /** 차트·캔들 API 와 동일 — 봉 시작 시각(epoch sec). ta4j Bar.endTime 은 종료 시각. */
+    private static long barStartEpoch(BarSeries series, int index) {
+        var bar = series.getBar(index);
+        return bar.getEndTime().getEpochSecond() - bar.getTimePeriod().getSeconds();
+    }
+
     // ── 개별 Criterion 계산 헬퍼 ─────────────────────────────────────────────
 
     private double enterPosition(PortfolioLedger ledger, boolean useLedger,