ZonedDateTime ParamProvider toString implementation

Author: poznachowski

neo-starter/src/main/java/com/neoteric/starter/jersey/time/ZonedDateTimeConverterProvider.java

@@ -9,6 +9,7 @@
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Type;
 import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
 import java.time.format.DateTimeParseException;
 
 @Singleton
@@ -41,7 +42,11 @@ public ZonedDateTime fromString(String value) {
 
         @Override
         public String toString(ZonedDateTime value) {
-            return null;
+            if (value == null) {
+                return null;
+            }
+            //TODO: Use injected formatter
+            return value.format(DateTimeFormatter.ISO_INSTANT);
         }
     }
 }