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/* ====================================================================
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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
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Unless required by applicable law or agreed to in writing, software
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package org.apache.poi.ss.formula.functions;
import java.util.Calendar;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.util.LocaleUtil;
/**
* Calculates the number of days between two dates based on a 360-day year
* (twelve 30-day months), which is used in some accounting calculations. Use
* this function to help compute payments if your accounting system is based on
* twelve 30-day months.
*
* {@code DAYS360(start_date,end_date,[method])}
*
*
* - Start_date, end_date (required):
* The two dates between which you want to know the number of days.
* If start_date occurs after end_date, the DAYS360 function returns a negative number.
*
* - Method (optional):
* A logical value that specifies whether to use the U.S. or European method in the calculation
*
* - Method set to false or omitted:
* the DAYS360 function uses the U.S. (NASD) method. If the starting date is the 31st of a month,
* it becomes equal to the 30th of the same month. If the ending date is the 31st of a month and
* the starting date is earlier than the 30th of a month, the ending date becomes equal to the
* 1st of the next month, otherwise the ending date becomes equal to the 30th of the same month.
* The month February and leap years are handled in the following way:
* On a non-leap year the function {@code =DAYS360("2/28/93", "3/1/93", FALSE)} returns 1 day
* because the DAYS360 function ignores the extra days added to February.
* On a leap year the function {@code =DAYS360("2/29/96","3/1/96", FALSE)} returns 1 day for
* the same reason.
*
* - Method Set to true:
* When you set the method parameter to TRUE, the DAYS360 function uses the European method.
* Starting dates or ending dates that occur on the 31st of a month become equal to the 30th of
* the same month. The month February and leap years are handled in the following way:
* On a non-leap year the function {@code =DAYS360("2/28/93", "3/1/93", TRUE)} returns
* 3 days because the DAYS360 function is counting the extra days added to February to give
* February 30 days.
* On a leap year the function {@code =DAYS360("2/29/96", "3/1/96", TRUE)} returns
* 2 days for the same reason.
*
*
* @see DAYS360 Function Produces Different Values Depending on the Version of Excel
*/
public class Days360 extends Var2or3ArgFunction {
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
try {
double d0 = NumericFunction.singleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex);
double d1 = NumericFunction.singleOperandEvaluate(arg1, srcRowIndex, srcColumnIndex);
return new NumberEval(evaluate(d0, d1, false));
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
@Override
public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1,
ValueEval arg2) {
try {
double d0 = NumericFunction.singleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex);
double d1 = NumericFunction.singleOperandEvaluate(arg1, srcRowIndex, srcColumnIndex);
ValueEval ve = OperandResolver.getSingleValue(arg2, srcRowIndex, srcColumnIndex);
Boolean method = OperandResolver.coerceValueToBoolean(ve, false);
return new NumberEval(evaluate(d0, d1, method != null && method.booleanValue()));
} catch (EvaluationException e) {
return e.getErrorEval();
}
}
private static double evaluate(double d0, double d1, boolean method) {
Calendar realStart = getDate(d0);
Calendar realEnd = getDate(d1);
int[] startingDate = getStartingDate(realStart, method);
int[] endingDate = getEndingDate(realEnd, startingDate, method);
return
(endingDate[0]*360.0+endingDate[1]*30.0+endingDate[2])-
(startingDate[0]*360.0+startingDate[1]*30.0+startingDate[2]);
}
private static Calendar getDate(double date) {
Calendar processedDate = LocaleUtil.getLocaleCalendar();
processedDate.setTime(DateUtil.getJavaDate(date, false));
return processedDate;
}
private static int[] getStartingDate(Calendar realStart, boolean method) {
int yyyy = realStart.get(Calendar.YEAR);
int mm = realStart.get(Calendar.MONTH);
int dd = Math.min(30, realStart.get(Calendar.DAY_OF_MONTH));
if (!method && isLastDayOfMonth(realStart)) {
dd = 30;
}
return new int[]{yyyy,mm,dd};
}
private static int[] getEndingDate(Calendar realEnd, int[] startingDate, boolean method) {
int yyyy = realEnd.get(Calendar.YEAR);
int mm = realEnd.get(Calendar.MONTH);
int dd = Math.min(30, realEnd.get(Calendar.DAY_OF_MONTH));
if (!method && realEnd.get(Calendar.DAY_OF_MONTH) == 31) {
if (startingDate[2] < 30) {
realEnd.set(Calendar.DAY_OF_MONTH, 1);
realEnd.add(Calendar.MONTH, 1);
yyyy = realEnd.get(Calendar.YEAR);
mm = realEnd.get(Calendar.MONTH);
dd = 1;
} else {
dd = 30;
}
}
return new int[]{yyyy,mm,dd};
}
private static boolean isLastDayOfMonth(Calendar date) {
int dayOfMonth = date.get(Calendar.DAY_OF_MONTH);
int lastDayOfMonth = date.getActualMaximum(Calendar.DAY_OF_MONTH);
return (dayOfMonth == lastDayOfMonth);
}
}