You could look at the following options.
http://code.google.com/p/gwt-time/
http://code.google.com/p/goda-time/
http://github.com/mping/gwt-joda-time
You could look at the following options.
http://code.google.com/p/gwt-time/
http://code.google.com/p/goda-time/
http://github.com/mping/gwt-joda-time