iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

https://jira.baeldung.com/browse/BAEL-7333

This commit is contained in:
michaelin007 2023-12-18 04:59:42 +00:00
parent 784cb2335c
commit c35c13d5d8
2 changed files with 130 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/monthintervalbetweentwodates/MonthInterval.java Normal file
View File

@ -0,0 +1,37 @@
package com.baeldung.monthintervalbetweentwodates;
import java.util.Calendar;
import java.util.Date;
public class MonthInterval {
public int monthsBetween(Date startDate, Date endDate) {
if (startDate == null || endDate == null) {
throw new IllegalArgumentException("Both startDate and endDate must be provided");
}
Calendar startCalendar = Calendar.getInstance();
startCalendar.setTime(startDate);
int startDateTotalMonths = 12 * startCalendar.get(Calendar.YEAR) + startCalendar.get(Calendar.MONTH);
Calendar endCalendar = Calendar.getInstance();
endCalendar.setTime(endDate);
int endDateTotalMonths = 12 * endCalendar.get(Calendar.YEAR) + endCalendar.get(Calendar.MONTH);
return endDateTotalMonths - startDateTotalMonths;
}
public int monthsBetweenWithDayValue(Date startDate, Date endDate) {
if (startDate == null || endDate == null) {
throw new IllegalArgumentException("Both startDate and endDate must be provided");
}
Calendar startCalendar = Calendar.getInstance();
startCalendar.setTime(startDate);
int startDayOfMonth = startCalendar.get(Calendar.DAY_OF_MONTH);
int startDateTotalMonths = 12 * startCalendar.get(Calendar.YEAR) + startCalendar.get(Calendar.MONTH);
Calendar endCalendar = Calendar.getInstance();
endCalendar.setTime(endDate);
int endDayOfMonth = endCalendar.get(Calendar.DAY_OF_MONTH);
int endDateTotalMonths = 12 * endCalendar.get(Calendar.YEAR) + endCalendar.get(Calendar.MONTH);
return (startDayOfMonth > endDayOfMonth) ? (endDateTotalMonths - startDateTotalMonths) - 1 : (endDateTotalMonths - startDateTotalMonths);
}
}

93
core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/monthintervalbetweentwodates/MonthIntervalUnitTest.java Normal file
View File

@ -0,0 +1,93 @@
package com.baeldung.monthintervalbetweentwodates;
import org.joda.time.DateTime;
import org.joda.time.Months;
import org.junit.jupiter.api.Test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.Period;
import java.time.YearMonth;
import java.time.temporal.ChronoUnit;
import java.util.Date;
import static org.junit.jupiter.api.Assertions.assertEquals;
class MonthIntervalUnitTest {
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingJodaTime_thenReturnMonthsDifference() {
DateTime firstDate = new DateTime(2023, 5, 25, 0, 0);
DateTime secondDate = new DateTime(2023, 11, 23, 0, 0);
int monthsBetween = Months.monthsBetween(firstDate, secondDate)
.getMonths();
assertEquals(5, monthsBetween);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingJodaTimeSetTimeToFirstDayOfMonth_thenReturnMonthsDifference() {
DateTime firstDate = new DateTime(2023, 5, 25, 0, 0).withDayOfMonth(1);
DateTime secondDate = new DateTime(2023, 11, 23, 0, 0).withDayOfMonth(1);
int monthsBetween = Months.monthsBetween(firstDate, secondDate)
.getMonths();
assertEquals(6, monthsBetween);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingPeriodClass_thenReturnMonthsDifference() {
Period diff = Period.between(LocalDate.parse("2023-05-25"), LocalDate.parse("2023-11-23"));
assertEquals(5, diff.getMonths());
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingPeriodClassAndAdjsutingDatesToFirstDayOfTheMonth_thenReturnMonthsDifference() {
Period diff = Period.between(LocalDate.parse("2023-05-25")
.withDayOfMonth(1), LocalDate.parse("2023-11-23")
.withDayOfMonth(1));
assertEquals(6, diff.getMonths());
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingChronoUnitAndYearMonth_thenReturnMonthsDifference() {
long diff = ChronoUnit.MONTHS.between(YearMonth.from(LocalDate.parse("2023-05-25")), LocalDate.parse("2023-11-23"));
assertEquals(6, diff);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingChronoUnitEnum_thenReturnMonthsDifference() {
long monthsBetween = ChronoUnit.MONTHS.between(LocalDate.parse("2023-05-25"), LocalDate.parse("2023-11-23"));
assertEquals(5, monthsBetween);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingChronoUnitEnumdSetTimeToFirstDayOfMonth_thenReturnMonthsDifference() {
long monthsBetween = ChronoUnit.MONTHS.between(LocalDate.parse("2023-05-25")
.withDayOfMonth(1), LocalDate.parse("2023-11-23")
.withDayOfMonth(1));
assertEquals(6, monthsBetween);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingLegacyDateApi_thenReturnMonthsDifference() throws ParseException {
MonthInterval monthDifference = new MonthInterval();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date startDate = sdf.parse("2016-05-31");
Date endDate = sdf.parse("2016-11-30");
int monthsBetween = monthDifference.monthsBetween(startDate, endDate);
assertEquals(6, monthsBetween);
}
@Test
void givenTwoDates_whenCalculatingMonthsBetweenUsingLegacyDateApiDayValueConsidered_thenReturnMonthsDifference() throws ParseException {
MonthInterval monthDifference = new MonthInterval();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date startDate = sdf.parse("2016-05-31");
Date endDate = sdf.parse("2016-11-28");
int monthsBetween = monthDifference.monthsBetweenWithDayValue(startDate, endDate);
assertEquals(5, monthsBetween);
}
}