feat(databinding): Add a New ValueConverter for LocalDateTime

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

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2013 the original author or authors.
+ *
+ * Licensed 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
+ *
+ *      http://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.databinding.converters
+
+import grails.databinding.converters.FormattedValueConverter;
+import groovy.transform.CompileStatic
+
+import java.text.SimpleDateFormat
+
+/**
+ * @author Jeff Brown
+ * @since 2.3
+ */
+@CompileStatic
+class FormattedDateValueConverter implements FormattedValueConverter {
+
+    def convert(value, String format) {
+        if(value instanceof Date) {
+            return value
+        }
+        else if(value instanceof CharSequence) {
+            String dateStr = value.toString()
+            if(!dateStr) {
+                return null
+            }
+            else {
+                def fmt = new SimpleDateFormat(format)
+                fmt.lenient = false
+                fmt.parse((String) value)
+            }
+        }
+    }
+
+    Class<?> getTargetType() {
+        Date
+    }
+
+}