날짜포멧 수정

frontend/src/components/ChartSlot.tsx

@@ -116,6 +116,8 @@ export interface ChartSlotHandle {
   /** 거래량 pane on/off */
   setVolumeVisible: (visible: boolean) => void;
   setPaneSeparatorOptions: (opts: ChartPaneSeparatorOptions) => void;
+  /** 차트 시간축·크로스헤어 날짜 형식 */
+  setChartTimeFormat: (format: string, timeframe?: Timeframe) => void;
 }
 
 // ── Props ─────────────────────────────────────────────────────────────────
@@ -323,7 +325,11 @@ const ChartSlot = forwardRef<ChartSlotHandle, ChartSlotProps>(function ChartSlot
     setPaneSeparatorOptions: (opts: ChartPaneSeparatorOptions) => {
       managerRef.current?.setPaneSeparatorOptions(opts);
     },
-  }), []);
+    setChartTimeFormat: (format: string, tf?: Timeframe) => {
+      managerRef.current?.setChartTimeFormat(format);
+      if (tf) managerRef.current?.setDisplayTimezone(displayTimezone ?? 'Asia/Seoul', tf, format);
+    },
+  }), [displayTimezone]);
 
   // 자석모드 변경 → ChartManager 크로스헤어 모드 즉시 반영
   useEffect(() => {