décalage horaire

CONT: Le décalage horaire entre l'est et l'ouest des États-Unis [...]
OBS: décalage: Avance ou recul, dans l'espace ou dans le temps.

CONT: Because of the existence of the ""O"" time zone, and the irregular time-zone boundaries, the navigational ""zone descriptions"" indicated at the top of [The Encyclopedia Americana's Time Zone Chart of the World] may differ numerically by one or more hours from the Greenwich time difference used in certain localities as noted on the face of the chart.