Unfortunately the AngularJS code uses a fixed formatter for the time when a browser doesn’t support the time input natively (eg firefox). The code specifies ‘HH:mm:ss.sss’ which is pretty pointless for most users I would imagine (I’m building a calendering app). Fortunately we can hook into this formatter and fix it, although the ideal would be to override it unfortunately there are local variables that we can’t override particularly easily. So I took the easy route of just modifying the string after it had already been parsed:

/* Attach to input time elements and switch their formatting to be HH:MM
 */             
angularApp.directive('ngModel', function( $filter ) {
    return {
        require: '?ngModel',
        link: function(scope, elem, attr, ngModel) {
            if( !ngModel )
                return;
            if( attr.type !== 'time' )
                return;
                    
            ngModel.$formatters.unshift(function(value) {
                return value.replace(/:00\.000$/, '')
            });
        }
    }   
});