Convert date time local Timezone to GMT

I need to get GMT time...
How to convert local time to GMT ?
     public static long getGMTNow()
         Calendar local = new GregorianCalendar();
         local.set(Calendar.HOUR_OF_DAY, 0);
         local.set(Calendar.MINUTE, 0);
         local.set(Calendar.SECOND, 0);
         System.out.println(local.getTime());
         System.out.println(local.getTimeInMillis());
         Calendar gmtC = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
         gmtC.setTimeInMillis(local.getTimeInMillis());
         System.out.println(gmtC.getTime());
         return gmtC.getTimeInMillis();
     }Result :
Thu Feb 12 00:00:00 EST 2009
1234414800034
Thu Feb 12 00:00:00 EST 2009
1234414800034

Calendar gpsTime = new GregorianCalendar(TimeZone.getTimeZone("GMT"));
         gpsTime.set(Calendar.HOUR_OF_DAY, 10);
         gpsTime.set(Calendar.MINUTE, 0);
         gpsTime.set(Calendar.SECOND, 0);
         System.out.println("gpsTime: "+gpsTime.getTime());
         Calendar realtime= new GregorianCalendar();
         realtime.set(Calendar.HOUR_OF_DAY, 5);
         realtime.set(Calendar.MINUTE, 0);
         realtime.set(Calendar.SECOND, 0);
         System.out.println("realtime: "+realtime.getTime());
         System.out.println("COMPARETO : "+ realtime.compareTo(gpsTime));
         long timediff = realtime.getTimeInMillis() - gpsTime.getTimeInMillis();
         System.out.println(timediff/1000 + " sec");RESULT :
gpsTime: Mon Feb 16 05:00:00 EST 2009
realtime: Mon Feb 16 05:00:00 EST 2009
COMPARETO : 1
0 secOk, I done my homework. getTime() will allways return local time so I need to set the GPS time to a GMT Calendar to get the right result.
Funny thing, look at the compareTo result....

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