hello,
try this
echo gmdate ("M d Y H:i:s", mktime (11,0,0,7,10,2001,0));
this shud print the gmt time wherever you are.
the timestamp parameter is important and here it is set to '0' as its not yet day light saving . if there is day light savings factor to be takien into account it will be set to 1.
see the date time functions in the manual.
regards