If you are willing to switch to a decent date-time library instead of the notoriously troublesome java.util.Date and java.util.Calendar classes bundled with Java, then read the example code below.
The two decent libraries for Java are Joda-Time and the new java.time package bundled with Java 8 (inspired by Joda-Time, defined by JSR 310).
Joda-Time
Here is some example code using Joda-Time 2.3.
java.util.Date date = new java.util.Date();
// Convert a Date into a Joda-Time DateTime.
// Specify a time zone rather than rely on default.
DateTimeZone timeZone = DateTimeZone.forID( "Europe/Istanbul" );
DateTime dateTime = new DateTime( date, timeZone );
DateTime dateTimeUtc = dateTime.withZone( DateTimeZone.UTC );
Dump to console…
System.out.println( "date: " + date );
System.out.println( "dateTime: " + dateTime );
System.out.println( "dateTimeUtc: " + dateTimeUtc );
When run…
date: Mon Mar 31 08:13:37 PDT 2014
dateTime: 2014-03-31T18:13:37.314+03:00
dateTimeUtc: 2014-03-31T15:13:37.314Z