London — the transatlantic financial anchor
London runs on GMT (winter) or BST (summer), flipping on the last Sunday of March and October. City of London financial hours anchor the European trading day — LSE opens 8 AM GMT/BST. London sits 5 h ahead of New York (winter) / 4 h (summer), 4.5 h behind Mumbai, 8 h ahead of San Francisco (winter). The transatlantic banking meeting window (8-11 AM ET / 1-4 PM GMT) anchors on London.