Forget GMT, just set the ea on your mt4 platform so it starts at 08.30 New York time.
TP +30 in 42 minutes today.
8:30 NY, DST = 12:30 GMT.
FMT must be set by your brokers GMT offset, you must know your brokers market watch offset to GMT.
for example: if your broker is GMT +3 offset (market watch) then you must set FMT to 15:30 (12:30 + 3) because 8:30 NY is 12:30 GMT.
cheers !