75 lines
2.8 KiB
Java
75 lines
2.8 KiB
Java
package org.apache.poi.hssf.record.formula.functions;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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import org.apache.poi.hssf.record.formula.eval.EvaluationException;
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import org.apache.poi.ss.usermodel.DateUtil;
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/**
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* Calculates the number of days between two dates based on a 360-day year
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* (twelve 30-day months), which is used in some accounting calculations. Use
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* this function to help compute payments if your accounting system is based on
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* twelve 30-day months.
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*
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*
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* @author PUdalau
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*/
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public class Days360 extends NumericFunction.TwoArg {
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@Override
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protected double evaluate(double d0, double d1) throws EvaluationException {
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Calendar startingDate = getStartingDate(d0);
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Calendar endingDate = getEndingDateAccordingToStartingDate(d1, startingDate);
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long startingDay = startingDate.get(Calendar.MONTH) * 30 + startingDate.get(Calendar.DAY_OF_MONTH);
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long endingDay = (endingDate.get(Calendar.YEAR) - startingDate.get(Calendar.YEAR)) * 360
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+ endingDate.get(Calendar.MONTH) * 30 + endingDate.get(Calendar.DAY_OF_MONTH);
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return endingDay - startingDay;
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}
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private Calendar getDate(double date) {
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Calendar processedDate = new GregorianCalendar();
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processedDate.setTime(DateUtil.getJavaDate(date, false));
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return processedDate;
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}
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private Calendar getStartingDate(double date) {
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Calendar startingDate = getDate(date);
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if (isLastDayOfMonth(startingDate)) {
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startingDate.set(Calendar.DAY_OF_MONTH, 30);
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}
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return startingDate;
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}
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private Calendar getEndingDateAccordingToStartingDate(double date, Calendar startingDate) {
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Calendar endingDate = getDate(date);
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endingDate.setTime(DateUtil.getJavaDate(date, false));
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if (isLastDayOfMonth(endingDate)) {
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if (startingDate.get(Calendar.DATE) < 30) {
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endingDate = getFirstDayOfNextMonth(endingDate);
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}
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}
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return endingDate;
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}
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private boolean isLastDayOfMonth(Calendar date) {
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Calendar clone = (Calendar) date.clone();
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clone.add(java.util.Calendar.MONTH, 1);
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clone.add(java.util.Calendar.DAY_OF_MONTH, -1);
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int lastDayOfMonth = clone.get(Calendar.DAY_OF_MONTH);
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return date.get(Calendar.DAY_OF_MONTH) == lastDayOfMonth;
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}
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private Calendar getFirstDayOfNextMonth(Calendar date) {
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Calendar newDate = (Calendar) date.clone();
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if (date.get(Calendar.MONTH) < Calendar.DECEMBER) {
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newDate.set(Calendar.MONTH, date.get(Calendar.MONTH) + 1);
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} else {
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newDate.set(Calendar.MONTH, 1);
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newDate.set(Calendar.YEAR, date.get(Calendar.YEAR) + 1);
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}
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newDate.set(Calendar.DATE, 1);
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return newDate;
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}
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}
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