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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.formula.functions;

import java.util.Calendar;
import java.util.Date;

import org.apache.poi.ss.formula.OperationEvaluationContext;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.util.LocaleUtil;

/**
 * Implementation for the Excel EOMONTH() function.

*

* EOMONTH() returns the date of the last day of a month..

*

* Syntax:
* EOMONTH(start_date,months)

*

* start_date is the starting date of the calculation * months is the number of months to be added to start_date, * to give a new date. For this new date, EOMONTH returns the date of * the last day of the month. months may be positive (in the future), * zero or negative (in the past). */ public class EOMonth implements FreeRefFunction { public static final FreeRefFunction instance = new EOMonth(); @Override public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { if (args.length != 2) { return ErrorEval.VALUE_INVALID; } try { double startDateAsNumber = NumericFunction.singleOperandEvaluate(args[0], ec.getRowIndex(), ec.getColumnIndex()); int months = (int) NumericFunction.singleOperandEvaluate(args[1], ec.getRowIndex(), ec.getColumnIndex()); // Excel treats date 0 as 1900-01-00; EOMONTH results in 1900-01-31 if (startDateAsNumber >= 0.0 && startDateAsNumber < 1.0) { startDateAsNumber = 1.0; } Date startDate = DateUtil.getJavaDate(startDateAsNumber, false); Calendar cal = LocaleUtil.getLocaleCalendar(); cal.setTime(startDate); cal.clear(Calendar.HOUR); cal.set(Calendar.HOUR_OF_DAY, 0); cal.clear(Calendar.MINUTE); cal.clear(Calendar.SECOND); cal.clear(Calendar.MILLISECOND); cal.add(Calendar.MONTH, months + 1); cal.set(Calendar.DAY_OF_MONTH, 1); cal.add(Calendar.DAY_OF_MONTH, -1); return new NumberEval(DateUtil.getExcelDate(cal.getTime())); } catch (EvaluationException e) { return e.getErrorEval(); } } }





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