Fix instant binding

Author: codeconsole

grails-databinding/src/main/groovy/org/grails/databinding/converters/DefaultConvertersConfiguration.java

@@ -177,6 +177,11 @@ ValueConverter instantValueConverter() {
         return jsr310ConvertersConfiguration.instantValueConverter();
     }
 
+    @Bean("instantStructuredBindingEditor")
+    TypedStructuredBindingEditor instantStructuredBindingEditor() {
+        return jsr310ConvertersConfiguration.instantStructuredBindingEditor();
+    }
+
     @Bean("defaultUUIDConverter")
     protected UUIDConverter defaultuuidConverter() {
         return new UUIDConverter();

grails-databinding/src/main/groovy/org/grails/databinding/converters/Jsr310ConvertersConfiguration.groovy

@@ -388,6 +388,21 @@ class Jsr310ConvertersConfiguration {
         }
     }
 
+    @Bean
+    TypedStructuredBindingEditor instantStructuredBindingEditor() {
+        new CustomDateBindingEditor<Instant>() {
+            @Override
+            Instant getDate(Calendar c) {
+                c.toInstant()
+            }
+
+            @Override
+            Class<?> getTargetType() {
+                Instant
+            }
+        }
+    }
+
     abstract class Jsr310DateValueConverter<T> implements ValueConverter {
 
         @Override