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BAEL-3632 Using Instant to check if Two Java Dates are On Same Day

This commit is contained in:
Al Niyas 2019-12-18 22:12:16 +03:00
parent 4d29d5ddcd
commit babe8e87de
2 changed files with 17 additions and 3 deletions
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10
core-java-modules/core-java-date-operations/src/main/java/com/baeldung/date/comparison/DateComparisonUtils.java
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@ -1,8 +1,10 @@
package com.baeldung.date.comparison; package com.baeldung.date.comparison;
import java.text.SimpleDateFormat; import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDate; import java.time.LocalDate;
import java.time.ZoneId; import java.time.ZoneId;
import java.time.temporal.ChronoUnit;
import java.util.Calendar; import java.util.Calendar;
import java.util.Date; import java.util.Date;
import java.util.TimeZone; import java.util.TimeZone;
@ -23,6 +25,14 @@ public class DateComparisonUtils {
return localDate1.isEqual(localDate2); return localDate1.isEqual(localDate2);
} }
public static boolean isSameDayUsingInstant(Date date1, Date date2) {
Instant instant1 = date1.toInstant()
.truncatedTo(ChronoUnit.DAYS);
Instant instant2 = date2.toInstant()
.truncatedTo(ChronoUnit.DAYS);
return instant1.equals(instant2);
}
public static boolean isSameDayUsingSimpleDateFormat(Date date1, Date date2) { public static boolean isSameDayUsingSimpleDateFormat(Date date1, Date date2) {
SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd"); SimpleDateFormat fmt = new SimpleDateFormat("yyyyMMdd");
return fmt.format(date1) return fmt.format(date1)

10
core-java-modules/core-java-date-operations/src/test/java/com/baeldung/date/comparison/DateComparisonUtilsUnitTest.java
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@ -1,13 +1,13 @@
package com.baeldung.date.comparison; package com.baeldung.date.comparison;
import org.junit.Test; import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.time.LocalDateTime; import java.time.LocalDateTime;
import java.time.ZoneId; import java.time.ZoneId;
import java.util.Date; import java.util.Date;
import static org.junit.Assert.assertFalse; import org.junit.Test;
import static org.junit.Assert.assertTrue;
public class DateComparisonUtilsUnitTest { public class DateComparisonUtilsUnitTest {
@ -23,6 +23,7 @@ public class DateComparisonUtilsUnitTest {
@Test @Test
public void givenDatesWithDifferentTime_whenIsSameDay_thenReturnsTrue() { public void givenDatesWithDifferentTime_whenIsSameDay_thenReturnsTrue() {
assertTrue(DateComparisonUtils.isSameDayUsingLocalDate(day1Morning, day1Evening)); assertTrue(DateComparisonUtils.isSameDayUsingLocalDate(day1Morning, day1Evening));
assertTrue(DateComparisonUtils.isSameDayUsingInstant(day1Morning, day1Evening));
assertTrue(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Morning, day1Evening)); assertTrue(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Morning, day1Evening));
assertTrue(DateComparisonUtils.isSameDayUsingCalendar(day1Morning, day1Evening)); assertTrue(DateComparisonUtils.isSameDayUsingCalendar(day1Morning, day1Evening));
assertTrue(DateComparisonUtils.isSameDayUsingApacheCommons(day1Morning, day1Evening)); assertTrue(DateComparisonUtils.isSameDayUsingApacheCommons(day1Morning, day1Evening));
@ -35,6 +36,9 @@ public class DateComparisonUtilsUnitTest {
assertFalse(DateComparisonUtils.isSameDayUsingLocalDate(day1Morning, day2Morning)); assertFalse(DateComparisonUtils.isSameDayUsingLocalDate(day1Morning, day2Morning));
assertFalse(DateComparisonUtils.isSameDayUsingLocalDate(day1Evening, day2Morning)); assertFalse(DateComparisonUtils.isSameDayUsingLocalDate(day1Evening, day2Morning));
assertFalse(DateComparisonUtils.isSameDayUsingInstant(day1Morning, day2Morning));
assertFalse(DateComparisonUtils.isSameDayUsingInstant(day1Evening, day2Morning));
assertFalse(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Morning, day2Morning)); assertFalse(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Morning, day2Morning));
assertFalse(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Evening, day2Morning)); assertFalse(DateComparisonUtils.isSameDayUsingSimpleDateFormat(day1Evening, day2Morning));