New Moon rises on Aug 10 3:08 AM GMT (Aug 9 11:08 PM EDT). That means for USA Ramadan starts on sunset of Aug 10.
For Bangladesh New Moon is on Aug 10 9:08AM BST; as such Ramadan starts in BD with the sunset of Aug 10 (same as US).
In layman's term, first day of fasting is Aug 11, 2010; and accordingly last day of fasting is Sept. 08, 2010 (as new moon is on Sept 8 10:30 AM GMT).
Have a blessed Ramadan.
Ref:
US Naval Observatory Moon Phases