To convert 6:30 EST to GMT, you would simply add four hours to the EST making it 10:30 GMT.
Because EST = UTC-5 and GMT = UTC, adding five hours to an EST time gives you the GMT equivalent.
0900
6.30 EST in Australia = 20.30 GMT 6.30 EST in America = 11.30 GMT
1000h gmt = 0500h est
EST is GMT -5. 9:00 AM GMT would be 4:00 AM EST.
MST = GMT -07:00
US EST is 5 hours behind GMT so if its 9.30 EST then it will be 14.30 GMT
7am EST is 5hours behind GMT
1630 GMT = 1130 American EST = 0230 Australian EST
4 PM Australian EST = 6 AM GMT 4 PM American EST = 9 PM GMT
At 2330 EST it's 0430 GMT.