# 4.0.2

* 兼容部分日期格式读取异常的问题

README.md

@@ -33,7 +33,7 @@ easyexcel重写了poi对07版Excel的解析，一个3M的excel用POI sax解析
 <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>easyexcel</artifactId>
-    <version>4.0.2</version>
+    <version>4.0.3</version>
 </dependency>
 ```
 

easyexcel-core/src/main/java/com/alibaba/excel/util/DateUtils.java

@@ -1,3 +1,20 @@
+/* ====================================================================
+   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.
+==================================================================== */
+
 package com.alibaba.excel.util;
 
 import java.math.BigDecimal;
@@ -9,13 +26,16 @@
 import java.time.LocalTime;
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
+import java.util.Calendar;
 import java.util.Date;
 import java.util.HashMap;
 import java.util.Locale;
 import java.util.Map;
+import java.util.TimeZone;
 import java.util.regex.Pattern;
 
 import org.apache.poi.ss.usermodel.DateUtil;
+import org.apache.poi.util.LocaleUtil;
 
 /**
  * Date utils
@@ -63,6 +83,15 @@ public class DateUtils {
 
     public static String defaultLocalDateFormat = DATE_FORMAT_10;
 
+    public static final int SECONDS_PER_MINUTE = 60;
+    public static final int MINUTES_PER_HOUR = 60;
+    public static final int HOURS_PER_DAY = 24;
+    public static final int SECONDS_PER_DAY = (HOURS_PER_DAY * MINUTES_PER_HOUR * SECONDS_PER_MINUTE);
+
+    // used to specify that date is invalid
+    private static final int BAD_DATE         = -1;
+    public static final long DAY_MILLISECONDS = SECONDS_PER_DAY * 1000L;
+
     private DateUtils() {}
 
     /**
@@ -301,13 +330,75 @@ private static DateFormat getCacheDateFormat(String dateFormat) {
      * @return Java representation of the date, or null if date is not a valid Excel date
      */
     public static Date getJavaDate(double date, boolean use1904windowing) {
-        //To calculate the Date, in the use of `org.apache.poi.ss.usermodel.DateUtil.getJavaDate(double, boolean,
-        // java.util.TimeZone, boolean), Date when similar `2023-01-01 00:00:00.500`, returns the`2023-01-01
-        // 00:00:01`, but excel in fact shows the `2023-01-01 00:00:00`.
-        // `org.apache.poi.ss.usermodel.DateUtil.getLocalDateTime(double, boolean, boolean)` There is no problem.
-        return Date.from(getLocalDateTime(date, use1904windowing).atZone(ZoneId.systemDefault()).toInstant());
+        Calendar calendar = getJavaCalendar(date, use1904windowing, null, true);
+        return calendar == null ? null : calendar.getTime();
     }
 
+    /**
+     * Get EXCEL date as Java Calendar with given time zone.
+     * @param date  The Excel date.
+     * @param use1904windowing  true if date uses 1904 windowing,
+     *  or false if using 1900 date windowing.
+     * @param timeZone The TimeZone to evaluate the date in
+     * @param roundSeconds round to closest second
+     * @return Java representation of the date, or null if date is not a valid Excel date
+     */
+    public static Calendar getJavaCalendar(double date, boolean use1904windowing, TimeZone timeZone, boolean roundSeconds) {
+        if (!isValidExcelDate(date)) {
+            return null;
+        }
+        int wholeDays = (int)Math.floor(date);
+        int millisecondsInDay = (int)((date - wholeDays) * DAY_MILLISECONDS + 0.5);
+        Calendar calendar;
+        if (timeZone != null) {
+            calendar = LocaleUtil.getLocaleCalendar(timeZone);
+        } else {
+            calendar = LocaleUtil.getLocaleCalendar(); // using default time-zone
+        }
+        setCalendar(calendar, wholeDays, millisecondsInDay, use1904windowing, roundSeconds);
+        return calendar;
+    }
+
+
+    public static void setCalendar(Calendar calendar, int wholeDays,
+        int millisecondsInDay, boolean use1904windowing, boolean roundSeconds) {
+        int startYear = 1900;
+        int dayAdjust = -1; // Excel thinks 2/29/1900 is a valid date, which it isn't
+        if (use1904windowing) {
+            startYear = 1904;
+            dayAdjust = 1; // 1904 date windowing uses 1/2/1904 as the first day
+        }
+        else if (wholeDays < 61) {
+            // Date is prior to 3/1/1900, so adjust because Excel thinks 2/29/1900 exists
+            // If Excel date == 2/29/1900, will become 3/1/1900 in Java representation
+            dayAdjust = 0;
+        }
+        calendar.set(startYear, Calendar.JANUARY, wholeDays + dayAdjust, 0, 0, 0);
+        calendar.set(Calendar.MILLISECOND, millisecondsInDay);
+        if (calendar.get(Calendar.MILLISECOND) == 0) {
+            calendar.clear(Calendar.MILLISECOND);
+        }
+        if (roundSeconds) {
+            // This is different from poi where you need to change 500 to 499
+            calendar.add(Calendar.MILLISECOND, 499);
+            calendar.clear(Calendar.MILLISECOND);
+        }
+    }
+
+
+    /**
+     * Given a double, checks if it is a valid Excel date.
+     *
+     * @return true if valid
+     * @param  value the double value
+     */
+
+    public static boolean isValidExcelDate(double value)
+    {
+        return (value > -Double.MIN_VALUE);
+    }
+
+
     /**
      * Given an Excel date with either 1900 or 1904 date windowing,
      * converts it to a java.time.LocalDateTime.

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/core/dataformat/DateFormatTest.java

@@ -3,10 +3,12 @@
 import java.io.File;
 import java.util.List;
 import java.util.Locale;
+import java.util.Map;
 import java.util.Objects;
 
 import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcel;
+import com.alibaba.fastjson2.JSON;
 
 import lombok.extern.slf4j.Slf4j;
 import org.junit.jupiter.api.Assertions;
@@ -22,13 +24,16 @@
 @Slf4j
 public class DateFormatTest {
 
+    private static File file07V2;
     private static File file07;
     private static File file03;
 
     @BeforeAll
     public static void init() {
         file07 = TestFileUtil.readFile("dataformat" + File.separator + "dataformat.xlsx");
         file03 = TestFileUtil.readFile("dataformat" + File.separator + "dataformat.xls");
+        file07V2 = TestFileUtil.readFile("dataformat" + File.separator + "dataformatv2.xlsx");
+
     }
 
     @Test
@@ -43,6 +48,16 @@ public void t02Read03() {
         readUs(file03);
     }
 
+    @Test
+    public void t03Read() {
+        List<Map<Integer, String>> dataMap = EasyExcel.read(file07V2).headRowNumber(0).doReadAllSync();
+        log.info("dataMap:{}", JSON.toJSONString(dataMap));
+        Assertions.assertEquals("15:00", dataMap.get(0).get(0));
+        Assertions.assertEquals("2023-1-01 00:00:00", dataMap.get(1).get(0));
+        Assertions.assertEquals("2023-1-01 00:00:00", dataMap.get(2).get(0));
+        Assertions.assertEquals("2023-1-01 00:00:01", dataMap.get(3).get(0));
+    }
+
     private void readCn(File file) {
         List<DateFormatData> list =
             EasyExcel.read(file, DateFormatData.class, null).locale(Locale.CHINA).sheet().doReadSync();

pom.xml

@@ -20,7 +20,7 @@
 
 
     <properties>
-        <revision>4.0.2</revision>
+        <revision>4.0.3</revision>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <jdk.version>1.8</jdk.version>
         <gpg.skip>true</gpg.skip>

update.md

@@ -1,3 +1,7 @@
+# 4.0.3
+
+* 兼容部分日期格式读取异常的问题
+
 # 4.0.2
 
 * 兼容某些特殊的xls: 修改了内置的样式导致判断样式错误