Does anyone know if you can use granulated sweetner instead of sugar for Phils recipes??

i am new to this .as anyone cooked the moist fruit cake that Phil did .as i did just has he explained in the demo  .....i put the cake in the oven for the said time the cake was not cooked .so i had to cook it much longer was the timing correct for this cake ......i normally do a boiled fruit cake with chopped tinned  pineapple and the juice  that takes just 1 hour . and is very moist.