--- /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.
+==================================================================== */
+package org.apache.poi.ss.formula.functions;
+
+import java.time.LocalDate;
+import java.time.temporal.ChronoUnit;
+import java.util.Date;
+
+import org.apache.poi.ss.formula.OperationEvaluationContext;
+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.ss.util.DateParser;
+import org.apache.poi.util.LocaleUtil;
+
+/**
+ * <p>Calculates the number of days between two dates based on a real year,
+ * which is used in some accounting calculations.</p>
+ *
+ * <p>
+ * {@code DAYS(end_date,start_date)}
+ *
+ * <ul>
+ * <li>Start_date, end_date (required):<br/>
+ * The two dates between which you want to know the number of days.<br/>
+ * If start_date occurs after end_date, the DAYS function returns a negative number.</li>
+ *
+ * </ul>
+ * </p>
+ *
+ * @see <a href="https://support.office.com/en-us/article/DAYS-function-57740535-D549-4395-8728-0F07BFF0B9DF">DAYS function - Microsoft Office</a>
+ */
+public class Days implements FreeRefFunction {
+
+ public static final Days instance = new Days();
+
+ private Days() {}
+
+ @Override
+ public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
+ return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1]);
+ }
+
+ private ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) {
+ double result;
+ try {
+ LocalDate d0 = getDate(arg0, srcRowIndex, srcColumnIndex);
+ LocalDate d1 = getDate(arg1, srcRowIndex, srcColumnIndex);
+ result = evaluate(d0, d1);
+ } catch (EvaluationException e) {
+ return e.getErrorEval();
+ }
+ return new NumberEval(result);
+ }
+
+ private static double evaluate(LocalDate endDate, LocalDate startDate) {
+ return ChronoUnit.DAYS.between(startDate, endDate);
+ }
+
+ private static LocalDate getDate(ValueEval eval, int srcRowIndex, int srcColumnIndex) throws EvaluationException {
+ ValueEval ve = OperandResolver.getSingleValue(eval, srcRowIndex, srcColumnIndex);
+ try {
+ double d0 = NumericFunction.singleOperandEvaluate(ve, srcRowIndex, srcColumnIndex);
+ return getDate(d0);
+ } catch (Exception e) {
+ String strText1 = OperandResolver.coerceValueToString(ve);
+ return DateParser.parseLocalDate(strText1);
+ }
+ }
+
+ private static LocalDate getDate(double date) {
+ Date d = DateUtil.getJavaDate(date, false);
+ return d.toInstant()
+ .atZone(LocaleUtil.getUserTimeZone().toZoneId())
+ .toLocalDate();
+ }
+}
--- /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.
+==================================================================== */
+package org.apache.poi.ss.formula.functions;
+
+import org.apache.poi.hssf.usermodel.HSSFCell;
+import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
+import org.apache.poi.hssf.usermodel.HSSFSheet;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.DateUtil;
+import org.apache.poi.ss.usermodel.FormulaError;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.time.LocalDate;
+
+import static org.apache.poi.ss.util.Utils.addRow;
+import static org.apache.poi.ss.util.Utils.assertDouble;
+import static org.apache.poi.ss.util.Utils.assertError;
+
+/**
+ * Testcase for DAYS() functions
+ */
+public class TestDays {
+
+ //https://support.microsoft.com/en-us/office/days-function-57740535-d549-4395-8728-0f07bff0b9df
+ @Test
+ void testMicrosoftExample1() throws IOException {
+ try (HSSFWorkbook wb = initWorkbook1()) {
+ HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
+ HSSFCell cell = wb.getSheetAt(0).getRow(0).createCell(12);
+ assertDouble(fe, cell, "DAYS(\"15-MAR-2021\",\"1-FEB-2021\")", 42, 0.00000000001);
+ assertDouble(fe, cell, "DAYS(A2,A3)", 364, 0.00000000001);
+ }
+ }
+
+ @Test
+ void testInvalid() throws IOException {
+ try (HSSFWorkbook wb = initWorkbook1()) {
+ HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
+ HSSFCell cell = wb.getSheetAt(0).getRow(0).createCell(12);
+ assertError(fe, cell, "DAYS(\"15-XYZ\",\"1-FEB-2021\")", FormulaError.VALUE);
+ assertError(fe, cell, "DAYS(\"15-MAR-2021\",\"1-XYZ\")", FormulaError.VALUE);
+ }
+ }
+
+ private HSSFWorkbook initWorkbook1() {
+ HSSFWorkbook wb = new HSSFWorkbook();
+ HSSFSheet sheet = wb.createSheet();
+ addRow(sheet, 0, "Data");
+ addRow(sheet, 1, DateUtil.getExcelDate(LocalDate.parse("2021-12-31")));
+ addRow(sheet, 2, DateUtil.getExcelDate(LocalDate.parse("2021-01-01")));
+ return wb;
+ }
+}
projects / poi.git / commitdiff