package org.apache.poi.hssf.usermodel;
import java.util.Calendar;
-import java.util.Date;
-import java.util.GregorianCalendar;
+
+import org.apache.poi.ss.usermodel.DateUtil;
/**
* Contains methods for dealing with Excel dates.
* @author Pavel Krupets (pkrupets at palmtreebusiness dot com)
*/
-public class HSSFDateUtil
-{
- private HSSFDateUtil()
- {
- }
-
- private static final int BAD_DATE =
- -1; // used to specify that date is invalid
- private static final long DAY_MILLISECONDS = 24 * 60 * 60 * 1000;
-
- /**
- * Given a Date, converts it into a double representing its internal Excel representation,
- * which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
- *
- * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
- * @param date the Date
- */
- public static double getExcelDate(Date date) {
- return getExcelDate(date, false);
- }
- /**
- * Given a Date, converts it into a double representing its internal Excel representation,
- * which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
- *
- * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
- * @param date the Date
- * @param use1904windowing Should 1900 or 1904 date windowing be used?
- */
- public static double getExcelDate(Date date, boolean use1904windowing) {
- Calendar calStart = new GregorianCalendar();
- calStart.setTime(date); // If date includes hours, minutes, and seconds, set them to 0
- return internalGetExcelDate(calStart, use1904windowing);
- }
- /**
- * Given a Date in the form of a Calendar, converts it into a double
- * representing its internal Excel representation, which is the
- * number of days since 1/1/1900. Fractional days represent hours,
- * minutes, and seconds.
- *
- * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
- * @param date the Calendar holding the date to convert
- * @param use1904windowing Should 1900 or 1904 date windowing be used?
- */
- public static double getExcelDate(Calendar date, boolean use1904windowing) {
- // Don't alter the supplied Calendar as we do our work
- return internalGetExcelDate( (Calendar)date.clone(), use1904windowing );
- }
- private static double internalGetExcelDate(Calendar date, boolean use1904windowing) {
- if ((!use1904windowing && date.get(Calendar.YEAR) < 1900) ||
- (use1904windowing && date.get(Calendar.YEAR) < 1904))
- {
- return BAD_DATE;
- } else {
- // Because of daylight time saving we cannot use
- // date.getTime() - calStart.getTimeInMillis()
- // as the difference in milliseconds between 00:00 and 04:00
- // can be 3, 4 or 5 hours but Excel expects it to always
- // be 4 hours.
- // E.g. 2004-03-28 04:00 CEST - 2004-03-28 00:00 CET is 3 hours
- // and 2004-10-31 04:00 CET - 2004-10-31 00:00 CEST is 5 hours
- double fraction = (((date.get(Calendar.HOUR_OF_DAY) * 60
- + date.get(Calendar.MINUTE)
- ) * 60 + date.get(Calendar.SECOND)
- ) * 1000 + date.get(Calendar.MILLISECOND)
- ) / ( double ) DAY_MILLISECONDS;
- Calendar calStart = dayStart(date);
-
- double value = fraction + absoluteDay(calStart, use1904windowing);
-
- if (!use1904windowing && value >= 60) {
- value++;
- } else if (use1904windowing) {
- value--;
- }
-
- return value;
- }
- }
-
- /**
- * Given an Excel date with using 1900 date windowing, and
- * converts it to a java.util.Date.
- *
- * NOTE: If the default <code>TimeZone</code> in Java uses Daylight
- * Saving Time then the conversion back to an Excel date may not give
- * the same value, that is the comparison
- * <CODE>excelDate == getExcelDate(getJavaDate(excelDate,false))</CODE>
- * is not always true. For example if default timezone is
- * <code>Europe/Copenhagen</code>, on 2004-03-28 the minute after
- * 01:59 CET is 03:00 CEST, if the excel date represents a time between
- * 02:00 and 03:00 then it is converted to past 03:00 summer time
- *
- * @param date The Excel date.
- * @return Java representation of the date, or null if date is not a valid Excel date
- * @see java.util.TimeZone
- */
- public static Date getJavaDate(double date) {
- return getJavaDate(date, false);
- }
- /**
- * Given an Excel date with either 1900 or 1904 date windowing,
- * converts it to a java.util.Date.
- *
- * NOTE: If the default <code>TimeZone</code> in Java uses Daylight
- * Saving Time then the conversion back to an Excel date may not give
- * the same value, that is the comparison
- * <CODE>excelDate == getExcelDate(getJavaDate(excelDate,false))</CODE>
- * is not always true. For example if default timezone is
- * <code>Europe/Copenhagen</code>, on 2004-03-28 the minute after
- * 01:59 CET is 03:00 CEST, if the excel date represents a time between
- * 02:00 and 03:00 then it is converted to past 03:00 summer time
- *
- * @param date The Excel date.
- * @param use1904windowing true if date uses 1904 windowing,
- * or false if using 1900 date windowing.
- * @return Java representation of the date, or null if date is not a valid Excel date
- * @see java.util.TimeZone
- */
- public static Date getJavaDate(double date, boolean use1904windowing) {
- if (isValidExcelDate(date)) {
- int startYear = 1900;
- int dayAdjust = -1; // Excel thinks 2/29/1900 is a valid date, which it isn't
- int wholeDays = (int)Math.floor(date);
- 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;
- }
- GregorianCalendar calendar = new GregorianCalendar(startYear,0,
- wholeDays + dayAdjust);
- int millisecondsInDay = (int)((date - Math.floor(date)) *
- DAY_MILLISECONDS + 0.5);
- calendar.set(GregorianCalendar.MILLISECOND, millisecondsInDay);
- return calendar.getTime();
- }
- else {
- return null;
- }
- }
-
- /**
- * Given a format ID and its format String, will check to see if the
- * format represents a date format or not.
- * Firstly, it will check to see if the format ID corresponds to an
- * internal excel date format (eg most US date formats)
- * If not, it will check to see if the format string only contains
- * date formatting characters (ymd-/), which covers most
- * non US date formats.
- *
- * @param formatIndex The index of the format, eg from ExtendedFormatRecord.getFormatIndex
- * @param formatString The format string, eg from FormatRecord.getFormatString
- * @see #isInternalDateFormat(int)
- */
- public static boolean isADateFormat(int formatIndex, String formatString) {
- // First up, is this an internal date format?
- if(isInternalDateFormat(formatIndex)) {
- return true;
- }
-
- // If we didn't get a real string, it can't be
- if(formatString == null || formatString.length() == 0) {
- return false;
- }
-
- String fs = formatString;
-
- // Translate \- into just -, before matching
- fs = fs.replaceAll("\\\\-","-");
- // And \, into ,
- fs = fs.replaceAll("\\\\,",",");
- // And '\ ' into ' '
- fs = fs.replaceAll("\\\\ "," ");
-
- // If it end in ;@, that's some crazy dd/mm vs mm/dd
- // switching stuff, which we can ignore
- fs = fs.replaceAll(";@", "");
-
- // If it starts with [$-...], then it is a date, but
- // who knows what that starting bit is all about
- fs = fs.replaceAll("\\[\\$\\-.*?\\]", "");
-
- // Otherwise, check it's only made up, in any case, of:
- // y m d h s - / , . :
- if(fs.matches("^[yYmMdDhHsS\\-/,. :]+$")) {
- return true;
- }
-
- return false;
- }
-
- /**
- * Given a format ID this will check whether the format represents
- * an internal excel date format or not.
- * @see #isADateFormat(int, java.lang.String)
- */
- public static boolean isInternalDateFormat(int format) {
- boolean retval =false;
-
- switch(format) {
- // Internal Date Formats as described on page 427 in
- // Microsoft Excel Dev's Kit...
- case 0x0e:
- case 0x0f:
- case 0x10:
- case 0x11:
- case 0x12:
- case 0x13:
- case 0x14:
- case 0x15:
- case 0x16:
- case 0x2d:
- case 0x2e:
- case 0x2f:
- retval = true;
- break;
-
- default:
- retval = false;
- break;
- }
- return retval;
- }
-
- /**
- * Check if a cell contains a date
- * Since dates are stored internally in Excel as double values
- * we infer it is a date if it is formatted as such.
- * @see #isADateFormat(int, String)
- * @see #isInternalDateFormat(int)
- */
- public static boolean isCellDateFormatted(HSSFCell cell) {
- if (cell == null) return false;
- boolean bDate = false;
-
- double d = cell.getNumericCellValue();
- if ( HSSFDateUtil.isValidExcelDate(d) ) {
- HSSFCellStyle style = cell.getCellStyle();
- int i = style.getDataFormat();
- String f = style.getDataFormatString();
- bDate = isADateFormat(i, f);
- }
- return bDate;
- }
- /**
- * Check if a cell contains a date, checking only for internal
- * excel date formats.
- * As Excel stores a great many of its dates in "non-internal"
- * date formats, you will not normally want to use this method.
- * @see #isADateFormat(int,String)
- * @see #isInternalDateFormat(int)
- */
- public static boolean isCellInternalDateFormatted(HSSFCell cell) {
- if (cell == null) return false;
- boolean bDate = false;
-
- double d = cell.getNumericCellValue();
- if ( HSSFDateUtil.isValidExcelDate(d) ) {
- HSSFCellStyle style = cell.getCellStyle();
- int i = style.getDataFormat();
- bDate = isInternalDateFormat(i);
- }
- return bDate;
- }
-
-
- /**
- * 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 a Calendar, return the number of days since 1900/12/31.
- *
- * @return days number of days since 1900/12/31
- * @param cal the Calendar
- * @exception IllegalArgumentException if date is invalid
- */
-
- static int absoluteDay(Calendar cal, boolean use1904windowing)
- {
- return cal.get(Calendar.DAY_OF_YEAR)
- + daysInPriorYears(cal.get(Calendar.YEAR), use1904windowing);
- }
-
- /**
- * Return the number of days in prior years since 1900
- *
- * @return days number of days in years prior to yr.
- * @param yr a year (1900 < yr < 4000)
- * @param use1904windowing
- * @exception IllegalArgumentException if year is outside of range.
- */
-
- private static int daysInPriorYears(int yr, boolean use1904windowing)
- {
- if ((!use1904windowing && yr < 1900) || (use1904windowing && yr < 1900)) {
- throw new IllegalArgumentException("'year' must be 1900 or greater");
- }
-
- int yr1 = yr - 1;
- int leapDays = yr1 / 4 // plus julian leap days in prior years
- - yr1 / 100 // minus prior century years
- + yr1 / 400 // plus years divisible by 400
- - 460; // leap days in previous 1900 years
-
- return 365 * (yr - (use1904windowing ? 1904 : 1900)) + leapDays;
- }
-
- // set HH:MM:SS fields of cal to 00:00:00:000
- private static Calendar dayStart(final Calendar cal)
- {
- cal.get(Calendar
- .HOUR_OF_DAY); // force recalculation of internal fields
- cal.set(Calendar.HOUR_OF_DAY, 0);
- cal.set(Calendar.MINUTE, 0);
- cal.set(Calendar.SECOND, 0);
- cal.set(Calendar.MILLISECOND, 0);
- cal.get(Calendar
- .HOUR_OF_DAY); // force recalculation of internal fields
- return cal;
- }
-
- // ---------------------------------------------------------------------------------------------------------
+public class HSSFDateUtil extends DateUtil {
+ protected static int absoluteDay(Calendar cal, boolean use1904windowing) {
+ return DateUtil.absoluteDay(cal, use1904windowing);
+ }
}
--- /dev/null
+/* ====================================================================
+ 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.
+==================================================================== */
+
+
+
+/*
+ * DateUtil.java
+ *
+ * Created on January 19, 2002, 9:30 AM
+ */
+package org.apache.poi.ss.usermodel;
+
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+/**
+ * Contains methods for dealing with Excel dates.
+ *
+ * @author Michael Harhen
+ * @author Glen Stampoultzis (glens at apache.org)
+ * @author Dan Sherman (dsherman at isisph.com)
+ * @author Hack Kampbjorn (hak at 2mba.dk)
+ * @author Alex Jacoby (ajacoby at gmail.com)
+ * @author Pavel Krupets (pkrupets at palmtreebusiness dot com)
+ */
+
+public class DateUtil
+{
+ protected DateUtil()
+ {
+ }
+
+ private static final int BAD_DATE =
+ -1; // used to specify that date is invalid
+ private static final long DAY_MILLISECONDS = 24 * 60 * 60 * 1000;
+
+ /**
+ * Given a Date, converts it into a double representing its internal Excel representation,
+ * which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
+ *
+ * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
+ * @param date the Date
+ */
+ public static double getExcelDate(Date date) {
+ return getExcelDate(date, false);
+ }
+ /**
+ * Given a Date, converts it into a double representing its internal Excel representation,
+ * which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
+ *
+ * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
+ * @param date the Date
+ * @param use1904windowing Should 1900 or 1904 date windowing be used?
+ */
+ public static double getExcelDate(Date date, boolean use1904windowing) {
+ Calendar calStart = new GregorianCalendar();
+ calStart.setTime(date); // If date includes hours, minutes, and seconds, set them to 0
+ return internalGetExcelDate(calStart, use1904windowing);
+ }
+ /**
+ * Given a Date in the form of a Calendar, converts it into a double
+ * representing its internal Excel representation, which is the
+ * number of days since 1/1/1900. Fractional days represent hours,
+ * minutes, and seconds.
+ *
+ * @return Excel representation of Date (-1 if error - test for error by checking for less than 0.1)
+ * @param date the Calendar holding the date to convert
+ * @param use1904windowing Should 1900 or 1904 date windowing be used?
+ */
+ public static double getExcelDate(Calendar date, boolean use1904windowing) {
+ // Don't alter the supplied Calendar as we do our work
+ return internalGetExcelDate( (Calendar)date.clone(), use1904windowing );
+ }
+ private static double internalGetExcelDate(Calendar date, boolean use1904windowing) {
+ if ((!use1904windowing && date.get(Calendar.YEAR) < 1900) ||
+ (use1904windowing && date.get(Calendar.YEAR) < 1904))
+ {
+ return BAD_DATE;
+ } else {
+ // Because of daylight time saving we cannot use
+ // date.getTime() - calStart.getTimeInMillis()
+ // as the difference in milliseconds between 00:00 and 04:00
+ // can be 3, 4 or 5 hours but Excel expects it to always
+ // be 4 hours.
+ // E.g. 2004-03-28 04:00 CEST - 2004-03-28 00:00 CET is 3 hours
+ // and 2004-10-31 04:00 CET - 2004-10-31 00:00 CEST is 5 hours
+ double fraction = (((date.get(Calendar.HOUR_OF_DAY) * 60
+ + date.get(Calendar.MINUTE)
+ ) * 60 + date.get(Calendar.SECOND)
+ ) * 1000 + date.get(Calendar.MILLISECOND)
+ ) / ( double ) DAY_MILLISECONDS;
+ Calendar calStart = dayStart(date);
+
+ double value = fraction + absoluteDay(calStart, use1904windowing);
+
+ if (!use1904windowing && value >= 60) {
+ value++;
+ } else if (use1904windowing) {
+ value--;
+ }
+
+ return value;
+ }
+ }
+
+ /**
+ * Given an Excel date with using 1900 date windowing, and
+ * converts it to a java.util.Date.
+ *
+ * NOTE: If the default <code>TimeZone</code> in Java uses Daylight
+ * Saving Time then the conversion back to an Excel date may not give
+ * the same value, that is the comparison
+ * <CODE>excelDate == getExcelDate(getJavaDate(excelDate,false))</CODE>
+ * is not always true. For example if default timezone is
+ * <code>Europe/Copenhagen</code>, on 2004-03-28 the minute after
+ * 01:59 CET is 03:00 CEST, if the excel date represents a time between
+ * 02:00 and 03:00 then it is converted to past 03:00 summer time
+ *
+ * @param date The Excel date.
+ * @return Java representation of the date, or null if date is not a valid Excel date
+ * @see java.util.TimeZone
+ */
+ public static Date getJavaDate(double date) {
+ return getJavaDate(date, false);
+ }
+ /**
+ * Given an Excel date with either 1900 or 1904 date windowing,
+ * converts it to a java.util.Date.
+ *
+ * NOTE: If the default <code>TimeZone</code> in Java uses Daylight
+ * Saving Time then the conversion back to an Excel date may not give
+ * the same value, that is the comparison
+ * <CODE>excelDate == getExcelDate(getJavaDate(excelDate,false))</CODE>
+ * is not always true. For example if default timezone is
+ * <code>Europe/Copenhagen</code>, on 2004-03-28 the minute after
+ * 01:59 CET is 03:00 CEST, if the excel date represents a time between
+ * 02:00 and 03:00 then it is converted to past 03:00 summer time
+ *
+ * @param date The Excel date.
+ * @param use1904windowing true if date uses 1904 windowing,
+ * or false if using 1900 date windowing.
+ * @return Java representation of the date, or null if date is not a valid Excel date
+ * @see java.util.TimeZone
+ */
+ public static Date getJavaDate(double date, boolean use1904windowing) {
+ if (isValidExcelDate(date)) {
+ int startYear = 1900;
+ int dayAdjust = -1; // Excel thinks 2/29/1900 is a valid date, which it isn't
+ int wholeDays = (int)Math.floor(date);
+ 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;
+ }
+ GregorianCalendar calendar = new GregorianCalendar(startYear,0,
+ wholeDays + dayAdjust);
+ int millisecondsInDay = (int)((date - Math.floor(date)) *
+ DAY_MILLISECONDS + 0.5);
+ calendar.set(GregorianCalendar.MILLISECOND, millisecondsInDay);
+ return calendar.getTime();
+ }
+ else {
+ return null;
+ }
+ }
+
+ /**
+ * Given a format ID and its format String, will check to see if the
+ * format represents a date format or not.
+ * Firstly, it will check to see if the format ID corresponds to an
+ * internal excel date format (eg most US date formats)
+ * If not, it will check to see if the format string only contains
+ * date formatting characters (ymd-/), which covers most
+ * non US date formats.
+ *
+ * @param formatIndex The index of the format, eg from ExtendedFormatRecord.getFormatIndex
+ * @param formatString The format string, eg from FormatRecord.getFormatString
+ * @see #isInternalDateFormat(int)
+ */
+ public static boolean isADateFormat(int formatIndex, String formatString) {
+ // First up, is this an internal date format?
+ if(isInternalDateFormat(formatIndex)) {
+ return true;
+ }
+
+ // If we didn't get a real string, it can't be
+ if(formatString == null || formatString.length() == 0) {
+ return false;
+ }
+
+ String fs = formatString;
+
+ // Translate \- into just -, before matching
+ fs = fs.replaceAll("\\\\-","-");
+ // And \, into ,
+ fs = fs.replaceAll("\\\\,",",");
+ // And '\ ' into ' '
+ fs = fs.replaceAll("\\\\ "," ");
+
+ // If it end in ;@, that's some crazy dd/mm vs mm/dd
+ // switching stuff, which we can ignore
+ fs = fs.replaceAll(";@", "");
+
+ // If it starts with [$-...], then it is a date, but
+ // who knows what that starting bit is all about
+ fs = fs.replaceAll("\\[\\$\\-.*?\\]", "");
+
+ // Otherwise, check it's only made up, in any case, of:
+ // y m d h s - / , . :
+ if(fs.matches("^[yYmMdDhHsS\\-/,. :]+$")) {
+ return true;
+ }
+
+ return false;
+ }
+
+ /**
+ * Given a format ID this will check whether the format represents
+ * an internal excel date format or not.
+ * @see #isADateFormat(int, java.lang.String)
+ */
+ public static boolean isInternalDateFormat(int format) {
+ boolean retval =false;
+
+ switch(format) {
+ // Internal Date Formats as described on page 427 in
+ // Microsoft Excel Dev's Kit...
+ case 0x0e:
+ case 0x0f:
+ case 0x10:
+ case 0x11:
+ case 0x12:
+ case 0x13:
+ case 0x14:
+ case 0x15:
+ case 0x16:
+ case 0x2d:
+ case 0x2e:
+ case 0x2f:
+ retval = true;
+ break;
+
+ default:
+ retval = false;
+ break;
+ }
+ return retval;
+ }
+
+ /**
+ * Check if a cell contains a date
+ * Since dates are stored internally in Excel as double values
+ * we infer it is a date if it is formatted as such.
+ * @see #isADateFormat(int, String)
+ * @see #isInternalDateFormat(int)
+ */
+ public static boolean isCellDateFormatted(Cell cell) {
+ if (cell == null) return false;
+ boolean bDate = false;
+
+ double d = cell.getNumericCellValue();
+ if ( DateUtil.isValidExcelDate(d) ) {
+ CellStyle style = cell.getCellStyle();
+ int i = style.getDataFormat();
+ String f = style.getDataFormatString();
+ bDate = isADateFormat(i, f);
+ }
+ return bDate;
+ }
+ /**
+ * Check if a cell contains a date, checking only for internal
+ * excel date formats.
+ * As Excel stores a great many of its dates in "non-internal"
+ * date formats, you will not normally want to use this method.
+ * @see #isADateFormat(int,String)
+ * @see #isInternalDateFormat(int)
+ */
+ public static boolean isCellInternalDateFormatted(Cell cell) {
+ if (cell == null) return false;
+ boolean bDate = false;
+
+ double d = cell.getNumericCellValue();
+ if ( DateUtil.isValidExcelDate(d) ) {
+ CellStyle style = cell.getCellStyle();
+ int i = style.getDataFormat();
+ bDate = isInternalDateFormat(i);
+ }
+ return bDate;
+ }
+
+
+ /**
+ * 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 a Calendar, return the number of days since 1900/12/31.
+ *
+ * @return days number of days since 1900/12/31
+ * @param cal the Calendar
+ * @exception IllegalArgumentException if date is invalid
+ */
+
+ protected static int absoluteDay(Calendar cal, boolean use1904windowing)
+ {
+ return cal.get(Calendar.DAY_OF_YEAR)
+ + daysInPriorYears(cal.get(Calendar.YEAR), use1904windowing);
+ }
+
+ /**
+ * Return the number of days in prior years since 1900
+ *
+ * @return days number of days in years prior to yr.
+ * @param yr a year (1900 < yr < 4000)
+ * @param use1904windowing
+ * @exception IllegalArgumentException if year is outside of range.
+ */
+
+ private static int daysInPriorYears(int yr, boolean use1904windowing)
+ {
+ if ((!use1904windowing && yr < 1900) || (use1904windowing && yr < 1900)) {
+ throw new IllegalArgumentException("'year' must be 1900 or greater");
+ }
+
+ int yr1 = yr - 1;
+ int leapDays = yr1 / 4 // plus julian leap days in prior years
+ - yr1 / 100 // minus prior century years
+ + yr1 / 400 // plus years divisible by 400
+ - 460; // leap days in previous 1900 years
+
+ return 365 * (yr - (use1904windowing ? 1904 : 1900)) + leapDays;
+ }
+
+ // set HH:MM:SS fields of cal to 00:00:00:000
+ private static Calendar dayStart(final Calendar cal)
+ {
+ cal.get(Calendar
+ .HOUR_OF_DAY); // force recalculation of internal fields
+ cal.set(Calendar.HOUR_OF_DAY, 0);
+ cal.set(Calendar.MINUTE, 0);
+ cal.set(Calendar.SECOND, 0);
+ cal.set(Calendar.MILLISECOND, 0);
+ cal.get(Calendar
+ .HOUR_OF_DAY); // force recalculation of internal fields
+ return cal;
+ }
+
+ // ---------------------------------------------------------------------------------------------------------
+}
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