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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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|
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http://www.apache.org/licenses/LICENSE-2.0 |
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|
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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 org.apache.poi.ss.formula.functions; |
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import java.util.Calendar; |
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import org.apache.poi.ss.formula.eval.EvaluationException; |
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import org.apache.poi.ss.formula.eval.NumberEval; |
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import org.apache.poi.ss.formula.eval.OperandResolver; |
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import org.apache.poi.ss.formula.eval.ValueEval; |
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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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/** |
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* <p>Calculates the number of days between two dates based on a real year |
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* , 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.</p> |
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* |
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* <p> |
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* {@code DAYS(end_date,start_date)} |
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* |
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* <ul> |
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* <li>Start_date, end_date (required):<br/> |
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* The two dates between which you want to know the number of days.<br/> |
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* If start_date occurs after end_date, the DAYS function returns a negative number.</li> |
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* |
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* </ul> |
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* </p> |
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* |
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* @see <a href="https://support.office.com/en-us/article/DAYS-function-57740535-D549-4395-8728-0F07BFF0B9DF">DAYS function - Microsoft Office</a> |
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*/ |
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public class Days extends Fixed2ArgFunction { |
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private final static long MILLIS_PER_DAY = 1000*60*60*24; |
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public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) { |
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double result; |
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try { |
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double d0 = NumericFunction.singleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex); |
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double d1 = NumericFunction.singleOperandEvaluate(arg1, srcRowIndex, srcColumnIndex); |
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result = evaluate(d0, d1); |
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} catch (EvaluationException e) { |
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return e.getErrorEval(); |
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} |
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return new NumberEval(result); |
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} |
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private static double evaluate(double d0, double d1) { |
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Calendar endDate = getDate(d0); |
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Calendar startDate = getDate(d1); |
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return daysBetween(startDate.getTimeInMillis(), endDate.getTimeInMillis()); |
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} |
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private static Calendar getDate(double date) { |
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Calendar processedDate = LocaleUtil.getLocaleCalendar(); |
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processedDate.setTime(DateUtil.getJavaDate(date, false)); |
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return processedDate; |
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} |
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/** Replace me with org.joda.time.Days.daysBetween */ |
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private static double daysBetween(long start, long end) { |
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return (end - start) / MILLIS_PER_DAY; |
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} |
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} |
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