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Note  that  18hrs  after  7AM friday  =  12 hours  + 6 hrs

7AM  +  12 hrs =    7PM  Friday

7PM Friday  +  6 hrs  =  1 AM Saturday

 + 30  more minutes   =     1:30 AM  Saurday

However....this is in terms of  Philadelphia time

There is an 18 hour time difference  between  Philadelphia and Auckland

Adding  18 hrs  to  1:30 AM Saturday  gives us  7:30 PM Saturday  = pickup time