Mikkey-f commented on code in PR #1020:
URL: https://github.com/apache/fesod/pull/1020#discussion_r3863020195


##########
fesod-sheet/src/main/java/org/apache/fesod/sheet/converters/zoneddatetime/ZonedDateTimeDateConverter.java:
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@@ -0,0 +1,57 @@
+/*
+ * 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
+ *
+ *   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.
+ */
+
+/*
+ * This file is part of the Apache Fesod (Incubating) project, which was 
derived from Alibaba EasyExcel.
+ *
+ * Copyright (C) 2018-2024 Alibaba Group Holding Ltd.
+ */
+
+package org.apache.fesod.sheet.converters.zoneddatetime;
+
+import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
+import org.apache.fesod.sheet.converters.Converter;
+import org.apache.fesod.sheet.metadata.GlobalConfiguration;
+import org.apache.fesod.sheet.metadata.data.WriteCellData;
+import org.apache.fesod.sheet.metadata.property.ExcelContentProperty;
+import org.apache.fesod.sheet.util.DateUtils;
+import org.apache.fesod.sheet.util.WorkBookUtil;
+
+/** ZonedDateTime and date converter. */
+public class ZonedDateTimeDateConverter implements Converter<ZonedDateTime> {
+    @Override
+    public Class<?> supportJavaTypeKey() {
+        return ZonedDateTime.class;
+    }
+
+    @Override
+    public WriteCellData<?> convertToExcelData(
+            ZonedDateTime value, ExcelContentProperty contentProperty, 
GlobalConfiguration globalConfiguration)
+            throws Exception {
+        LocalDateTime localDateTime = value.toLocalDateTime();
+        WriteCellData<?> cellData = new WriteCellData<>(localDateTime);
+        String format = null;
+        if (contentProperty != null && 
contentProperty.getDateTimeFormatProperty() != null) {
+            format = contentProperty.getDateTimeFormatProperty().getFormat();

Review Comment:
   Empty `@DateTimeFormat` values are passed through to 
`WorkBookUtil.fillDataFormat` as-is. `fillDataFormat` only substitutes the 
default format when the argument is `null` — an empty string (`""`) is written 
into the cell style as-is, so `@DateTimeFormat(value = "")` produces a DATE 
cell with **no format at all** instead of falling back to `yyyy-MM-dd HH:mm:ss`.
   
   Suggest normalizing the empty format to `null` before the call:
   
   ```java
   String format = null;
   if (contentProperty != null && contentProperty.getDateTimeFormatProperty() 
!= null) {
       format = contentProperty.getDateTimeFormatProperty().getFormat();
       if (StringUtils.isEmpty(format)) {
           format = null;
       }
   }
   WorkBookUtil.fillDataFormat(cellData, format, DateUtils.defaultDateFormat);
   ```
   
   This also keeps the DATE direction consistent with the string converter 
below, which already falls back when the format is empty.



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