# Data, sessions and time

What updates live, what is set once a day, and why everything is in New York time.

## Two clocks

- **Standing positioning** (the EOD walls and the book behind them) is set
  once per trading day. Treat it as the day's starting map.
- **Live data** (price, today's flow and volume, the live levels) updates
  through the session. Watch it for confirmation as price approaches a level.

Each panel shows when it last updated. If a reading is older than usual, the
panel says so.

## Sessions

- The US cash session runs 9:30 to 16:00 New York time, with early closes and
  holidays taken into account.
- ES, NQ and GC also trade overnight. Overnight views are labelled
  **overnight** and carry a note, because positioning changes little until the
  cash open.
- At the weekend and on holidays the levels hold their last session's values.

## Time zone

Every time in q-bitf is New York time (ET), whatever your computer's time
zone. The trading day, same-day-expiry detection and the daily reset all
follow the New York calendar, so showing any other zone would disagree with
the app's own day boundary.