The FTSE Global 100 Index, covering the largest multinationals worldwide, is now being calculated in real time and is the first step in FTSE moving global indices over to a 24-hour real time environment. Over the next 18 months the FTSE All-Word Index series will be caluculated and distributed on a 24 hour real-time basis.The FTSE Global 100 Index calculation begins each day at 0200 GMT.