Use consistent ISO-8601 formatting for rendering JSON Date, Calendar, LocalDateTime, and Instant properties

grails-converters/src/main/groovy/org/grails/web/converters/configuration/ConvertersConfigurationInitializer.java

@@ -112,6 +112,12 @@ private void initJSONConfiguration() {
             }
             marshallers.add(new org.grails.web.converters.marshaller.json.DateMarshaller());
         }
+        marshallers.add(new org.grails.web.converters.marshaller.json.CalendarMarshaller());
+        marshallers.add(new org.grails.web.converters.marshaller.json.InstantMarshaller());
+        marshallers.add(new org.grails.web.converters.marshaller.json.LocalDateMarshaller());
+        marshallers.add(new org.grails.web.converters.marshaller.json.LocalDateTimeMarshaller());
+        marshallers.add(new org.grails.web.converters.marshaller.json.OffsetDateTimeMarshaller());
+        marshallers.add(new org.grails.web.converters.marshaller.json.ZonedDateTimeMarshaller());
         marshallers.add(new org.grails.web.converters.marshaller.json.ToStringBeanMarshaller());
 
         boolean includeDomainVersion = includeDomainVersionProperty(grailsConfig, "json");

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/CalendarMarshaller.java

@@ -0,0 +1,70 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.text.Format;
+import java.util.Calendar;
+import java.util.Locale;
+import java.util.TimeZone;
+
+import org.apache.commons.lang3.time.FastDateFormat;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts a Calendar Object to ISO-8601 format with Z suffix.
+ *
+ * @since 7.0
+ */
+public class CalendarMarshaller implements ObjectMarshaller<JSON> {
+
+    private final Format formatter;
+
+    /**
+     * Constructor with a custom formatter.
+     * @param formatter the formatter
+     */
+    public CalendarMarshaller(Format formatter) {
+        this.formatter = formatter;
+    }
+
+    /**
+     * Default constructor.
+     */
+    public CalendarMarshaller() {
+        this(FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", TimeZone.getTimeZone("GMT"), Locale.US));
+    }
+
+    public boolean supports(Object object) {
+        return object instanceof Calendar;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            Calendar calendar = (Calendar) object;
+            converter.getWriter().value(formatter.format(calendar.getTime()));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/DateMarshaller.java

@@ -53,7 +53,7 @@ public DateMarshaller(Format formatter) {
      * Default constructor.
      */
     public DateMarshaller() {
-        this(FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone("GMT"), Locale.US));
+        this(FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", TimeZone.getTimeZone("GMT"), Locale.US));
     }
 
     public boolean supports(Object object) {

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/InstantMarshaller.java

@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.time.Instant;
+import java.time.format.DateTimeFormatter;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts an Instant to ISO-8601 format with Z suffix.
+ *
+ * @since 7.0
+ */
+public class InstantMarshaller implements ObjectMarshaller<JSON> {
+
+    public boolean supports(Object object) {
+        return object instanceof Instant;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            Instant instant = (Instant) object;
+            converter.getWriter().value(DateTimeFormatter.ISO_INSTANT.format(instant));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/LocalDateMarshaller.java

@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.time.LocalDate;
+import java.time.format.DateTimeFormatter;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts a LocalDate to ISO-8601 date format (YYYY-MM-DD).
+ *
+ * @since 7.0
+ */
+public class LocalDateMarshaller implements ObjectMarshaller<JSON> {
+
+    public boolean supports(Object object) {
+        return object instanceof LocalDate;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            LocalDate localDate = (LocalDate) object;
+            converter.getWriter().value(DateTimeFormatter.ISO_LOCAL_DATE.format(localDate));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/LocalDateTimeMarshaller.java

@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts a LocalDateTime to ISO-8601 format (without timezone).
+ *
+ * @since 7.0
+ */
+public class LocalDateTimeMarshaller implements ObjectMarshaller<JSON> {
+
+    public boolean supports(Object object) {
+        return object instanceof LocalDateTime;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            LocalDateTime localDateTime = (LocalDateTime) object;
+            converter.getWriter().value(DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(localDateTime));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/OffsetDateTimeMarshaller.java

@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeFormatter;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts an OffsetDateTime to ISO-8601 format with timezone offset.
+ *
+ * @since 7.0
+ */
+public class OffsetDateTimeMarshaller implements ObjectMarshaller<JSON> {
+
+    public boolean supports(Object object) {
+        return object instanceof OffsetDateTime;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            OffsetDateTime offsetDateTime = (OffsetDateTime) object;
+            converter.getWriter().value(DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(offsetDateTime));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}

grails-converters/src/main/groovy/org/grails/web/converters/marshaller/json/ZonedDateTimeMarshaller.java

@@ -0,0 +1,49 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.grails.web.converters.marshaller.json;
+
+import java.time.ZonedDateTime;
+import java.time.format.DateTimeFormatter;
+
+import grails.converters.JSON;
+import org.grails.web.converters.exceptions.ConverterException;
+import org.grails.web.converters.marshaller.ObjectMarshaller;
+import org.grails.web.json.JSONException;
+
+/**
+ * JSON ObjectMarshaller which converts a ZonedDateTime to ISO-8601 format with timezone offset.
+ *
+ * @since 7.0
+ */
+public class ZonedDateTimeMarshaller implements ObjectMarshaller<JSON> {
+
+    public boolean supports(Object object) {
+        return object instanceof ZonedDateTime;
+    }
+
+    public void marshalObject(Object object, JSON converter) throws ConverterException {
+        try {
+            ZonedDateTime zonedDateTime = (ZonedDateTime) object;
+            converter.getWriter().value(DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(zonedDateTime));
+        }
+        catch (JSONException e) {
+            throw new ConverterException(e);
+        }
+    }
+}