Le
56325113b3
Every displayed timestamp previously relied on either the viewer's browser-local timezone (toLocaleString/toLocaleDateString/toLocaleTimeString) or raw UTC ISO-string slicing (.slice(0,10)/.slice(5,16)) — both wrong for a Vietnam-based system, and the string-slicing approach could show the wrong calendar date entirely near the UTC/GMT+7 day boundary. Added frontend/src/utils/dateTime.ts with formatVN* helpers that explicitly render in Asia/Ho_Chi_Minh regardless of the viewer's machine, and applied them across AdminPage, OrderPanel's live clock, SignalPanel, ProfilePage, AuditLogPage, and BacktestPage (including the new walk-forward fold/history dates) — 10 display sites total. Also consolidated the timeframe list (15m/30m/1h/4h/1d/1w/1M), which had drifted into 4 different copies across BacktestPage, ProfilePage, ChartToolbar, and AlertsPage, into a single frontend/src/utils/timeframes.ts source of truth. Extended Walk-Forward's timeframe options from 1h/4h to 1h/4h/1d, and fixed a latent backend bug where backtest_engine.py's tf_minutes map was missing "1d", silently defaulting to 30 minutes for any daily-timeframe backtest. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>