fix: show archive chart times in UTC+8 and parse Beijing wall clock

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_hub_symbol_archive_lib.py

@@ -6,10 +6,16 @@ import tempfile
 from pathlib import Path
 
 from hub_ohlcv_lib import aggregate_ohlcv_bars
+from datetime import datetime, timezone
+from zoneinfo import ZoneInfo
+
 from hub_symbol_archive_lib import (
+    CHART_DISPLAY_TZ,
     _fill_missing_bars,
     init_db,
     load_symbol_trades,
+    ms_to_wall_clock_str,
+    parse_wall_clock_ms,
     resolve_archive_chart,
     upsert_bars_5m,
     upsert_trade_overlay,
@@ -200,3 +206,13 @@ def test_list_with_overlay_filters():
         assert len(sick_only) == 1
         profit_only = list_symbol_rows(filter_profit=True, db_path=db)
         assert len(profit_only) == 1
+
+
+def test_parse_wall_clock_ms_uses_utc_plus_8():
+    ms = parse_wall_clock_ms("2026-06-07 20:30:00")
+    assert ms is not None
+    dt_utc = datetime.fromtimestamp(ms / 1000.0, tz=timezone.utc)
+    dt_bj = dt_utc.astimezone(CHART_DISPLAY_TZ)
+    assert dt_bj.strftime("%Y-%m-%d %H:%M:%S") == "2026-06-07 20:30:00"
+    assert ms_to_wall_clock_str(ms) == "2026-06-07 20:30:00"
+    assert parse_wall_clock_ms("2026-06-07 20:30") == ms