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@ -1,3 +1,20 @@
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/* ==================================================================== |
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Licensed to the Apache Software Foundation (ASF) under one or more |
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contributor license agreements. See the NOTICE file distributed with |
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this work for additional information regarding copyright ownership. |
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The ASF licenses this file to You under the Apache License, Version 2.0 |
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(the "License"); you may not use this file except in compliance with |
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the License. You may obtain a copy of the License at |
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software |
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distributed under the License is distributed on an "AS IS" BASIS, |
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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==================================================================== */ |
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package com.alibaba.excel.util; |
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import java.math.BigDecimal; |
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@ -9,13 +26,16 @@ import java.time.LocalDateTime;
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import java.time.LocalTime; |
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import java.time.ZoneId; |
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import java.time.format.DateTimeFormatter; |
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import java.util.Calendar; |
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import java.util.Date; |
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import java.util.HashMap; |
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import java.util.Locale; |
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import java.util.Map; |
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import java.util.TimeZone; |
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import java.util.regex.Pattern; |
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import org.apache.poi.ss.usermodel.DateUtil; |
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import org.apache.poi.util.LocaleUtil; |
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/** |
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* Date utils |
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@ -63,6 +83,15 @@ public class DateUtils {
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public static String defaultLocalDateFormat = DATE_FORMAT_10; |
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public static final int SECONDS_PER_MINUTE = 60; |
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public static final int MINUTES_PER_HOUR = 60; |
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public static final int HOURS_PER_DAY = 24; |
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public static final int SECONDS_PER_DAY = (HOURS_PER_DAY * MINUTES_PER_HOUR * SECONDS_PER_MINUTE); |
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// used to specify that date is invalid
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private static final int BAD_DATE = -1; |
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public static final long DAY_MILLISECONDS = SECONDS_PER_DAY * 1000L; |
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private DateUtils() {} |
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/** |
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@ -301,13 +330,75 @@ public class DateUtils {
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* @return Java representation of the date, or null if date is not a valid Excel date |
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*/ |
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public static Date getJavaDate(double date, boolean use1904windowing) { |
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//To calculate the Date, in the use of `org.apache.poi.ss.usermodel.DateUtil.getJavaDate(double, boolean,
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// java.util.TimeZone, boolean), Date when similar `2023-01-01 00:00:00.500`, returns the`2023-01-01
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// 00:00:01`, but excel in fact shows the `2023-01-01 00:00:00`.
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// `org.apache.poi.ss.usermodel.DateUtil.getLocalDateTime(double, boolean, boolean)` There is no problem.
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return Date.from(getLocalDateTime(date, use1904windowing).atZone(ZoneId.systemDefault()).toInstant()); |
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Calendar calendar = getJavaCalendar(date, use1904windowing, null, true); |
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return calendar == null ? null : calendar.getTime(); |
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} |
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/** |
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* Get EXCEL date as Java Calendar with given time zone. |
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* @param date The Excel date. |
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* @param use1904windowing true if date uses 1904 windowing, |
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* or false if using 1900 date windowing. |
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* @param timeZone The TimeZone to evaluate the date in |
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* @param roundSeconds round to closest second |
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* @return Java representation of the date, or null if date is not a valid Excel date |
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*/ |
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public static Calendar getJavaCalendar(double date, boolean use1904windowing, TimeZone timeZone, boolean roundSeconds) { |
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if (!isValidExcelDate(date)) { |
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return null; |
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} |
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int wholeDays = (int)Math.floor(date); |
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int millisecondsInDay = (int)((date - wholeDays) * DAY_MILLISECONDS + 0.5); |
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Calendar calendar; |
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if (timeZone != null) { |
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calendar = LocaleUtil.getLocaleCalendar(timeZone); |
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} else { |
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calendar = LocaleUtil.getLocaleCalendar(); // using default time-zone
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} |
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setCalendar(calendar, wholeDays, millisecondsInDay, use1904windowing, roundSeconds); |
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return calendar; |
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} |
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public static void setCalendar(Calendar calendar, int wholeDays, |
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int millisecondsInDay, boolean use1904windowing, boolean roundSeconds) { |
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int startYear = 1900; |
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int dayAdjust = -1; // Excel thinks 2/29/1900 is a valid date, which it isn't
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if (use1904windowing) { |
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startYear = 1904; |
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dayAdjust = 1; // 1904 date windowing uses 1/2/1904 as the first day
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} |
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else if (wholeDays < 61) { |
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// Date is prior to 3/1/1900, so adjust because Excel thinks 2/29/1900 exists
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// If Excel date == 2/29/1900, will become 3/1/1900 in Java representation
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dayAdjust = 0; |
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} |
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calendar.set(startYear, Calendar.JANUARY, wholeDays + dayAdjust, 0, 0, 0); |
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calendar.set(Calendar.MILLISECOND, millisecondsInDay); |
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if (calendar.get(Calendar.MILLISECOND) == 0) { |
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calendar.clear(Calendar.MILLISECOND); |
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} |
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if (roundSeconds) { |
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// This is different from poi where you need to change 500 to 499
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calendar.add(Calendar.MILLISECOND, 499); |
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calendar.clear(Calendar.MILLISECOND); |
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} |
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} |
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/** |
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* Given a double, checks if it is a valid Excel date. |
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* |
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* @return true if valid |
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* @param value the double value |
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*/ |
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public static boolean isValidExcelDate(double value) |
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{ |
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return (value > -Double.MIN_VALUE); |
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} |
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/** |
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* Given an Excel date with either 1900 or 1904 date windowing, |
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* converts it to a java.time.LocalDateTime. |
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@ -470,31 +561,10 @@ public class DateUtils {
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case 0x14: |
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case 0x15: |
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case 0x16: |
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// 27-36
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case 0x1b: |
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case 0x1c: |
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case 0x1d: |
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case 0x1e: |
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case 0x1f: |
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case 0x20: |
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case 0x21: |
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case 0x22: |
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case 0x23: |
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case 0x24: |
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// 45-47
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case 0x2d: |
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case 0x2e: |
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case 0x2f: |
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// 50-58
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case 0x32: |
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case 0x33: |
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case 0x34: |
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case 0x35: |
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case 0x36: |
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case 0x37: |
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case 0x38: |
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case 0x39: |
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case 0x3a: |
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return true; |
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} |
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return false; |
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psxjoy
6 months ago
committed by
GitHub