Adding Examples for ZonedDateTime, OffsetDateTime and OffsetTime

core-java/src/main/java/com/baeldung/manifest/MANIFEST.MF

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+Main-Class: com.baeldung.manifest.AppExample

core-java/src/main/java/com/baeldung/zoneddatetime/OffsetDateTimeExample.java

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+package com.baeldung.zoneddatetime;
+
+import java.time.LocalDateTime;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+
+public class OffsetDateTimeExample {
+
+    public OffsetDateTime getCurrentTimeByZoneOffset(String region) {
+        LocalDateTime now = LocalDateTime.now();
+        ZoneId zone = ZoneId.of(region);
+        ZoneOffset zoneOffSet= zone.getRules().getOffset(now);
+        OffsetDateTime date = OffsetDateTime.now(zoneOffSet);
+        return date;
+    }
+}

core-java/src/main/java/com/baeldung/zoneddatetime/OffsetTimeExample.java

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+package com.baeldung.zoneddatetime;
+
+import java.time.LocalDateTime;
+import java.time.OffsetTime;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+
+public class OffsetTimeExample {
+
+    public OffsetTime getCurrentTimeByZoneOffset(String region) {
+        LocalDateTime now = LocalDateTime.now();
+        ZoneId zone = ZoneId.of(region);
+        ZoneOffset zoneOffSet = zone.getRules()
+            .getOffset(now);
+        OffsetTime time = OffsetTime.now(zoneOffSet);
+        return time;
+    }
+}

core-java/src/main/java/com/baeldung/zoneddatetime/ZoneDateTimeExample.java

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+package com.baeldung.zoneddatetime;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+
+public class ZoneDateTimeExample {
+
+    public ZonedDateTime getCurrentTimeByZoneId(String region) {
+        ZoneId zone = ZoneId.of(region);
+        ZonedDateTime date = ZonedDateTime.now(zone);
+        return date;
+    }
+
+    public ZonedDateTime convertZonedDateTime(ZonedDateTime sourceDate, String destZone) {
+
+        ZoneId destZoneId = ZoneId.of(destZone);
+        ZonedDateTime destDate = sourceDate.withZoneSameInstant(destZoneId);
+
+        return destDate;
+    }
+}

core-java/src/test/java/com/baeldung/zoneddatetime/OffsetDateTimeExampleUnitTest.java

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+package com.baeldung.zoneddatetime;
+
+import static org.junit.Assert.assertTrue;
+
+import java.time.LocalDateTime;
+import java.time.OffsetDateTime;
+import java.time.ZoneId;
+
+import org.junit.Test;
+
+public class OffsetDateTimeExampleUnitTest {
+
+    OffsetDateTimeExample offsetDateTimeExample = new OffsetDateTimeExample();
+
+    @Test
+    public void givenZoneOffset_whenGetCurrentTime_thenResultHasZone() {
+        String zone = "Europe/Berlin";
+        OffsetDateTime time = offsetDateTimeExample.getCurrentTimeByZoneOffset(zone);   
+
+        assertTrue(time.getOffset()
+            .equals(ZoneId.of(zone)
+                .getRules()
+                .getOffset(LocalDateTime.now())));
+    }
+}

core-java/src/test/java/com/baeldung/zoneddatetime/OffsetTimeExampleUnitTest.java

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+package com.baeldung.zoneddatetime;
+
+import static org.junit.Assert.assertTrue;
+
+import java.time.LocalDateTime;
+import java.time.OffsetTime;
+import java.time.ZoneId;
+
+import org.junit.Test;
+
+public class OffsetTimeExampleUnitTest {
+
+    OffsetTimeExample offsetTimeExample = new OffsetTimeExample();
+
+    @Test
+    public void givenZoneOffset_whenGetCurrentTime_thenResultHasZone() {
+        String zone = "Europe/Berlin";
+        OffsetTime time = offsetTimeExample.getCurrentTimeByZoneOffset(zone);   
+
+        assertTrue(time.getOffset()
+            .equals(ZoneId.of(zone)
+                .getRules()
+                .getOffset(LocalDateTime.now())));
+    }
+}

core-java/src/test/java/com/baeldung/zoneddatetime/ZoneDateTimeExampleUnitTest.java

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+package com.baeldung.zoneddatetime;
+
+import static org.junit.Assert.assertTrue;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+
+import org.junit.Test;
+
+public class ZoneDateTimeExampleUnitTest {
+
+    ZoneDateTimeExample zoneDateTimeExample = new ZoneDateTimeExample();
+
+    @Test
+    public void givenZone_whenGetCurrentTime_thenResultHasZone() {
+        String zone = "Europe/Berlin";
+        ZonedDateTime time = zoneDateTimeExample.getCurrentTimeByZoneId(zone);
+        assertTrue(time.getZone()
+            .equals(ZoneId.of(zone)));
+    }
+    
+    @Test
+    public void givenZones_whenConvertDateByZone_thenGetConstantDiff() {
+        String sourceZone = "Europe/Berlin";
+        String destZone = "Asia/Tokyo";
+        ZonedDateTime sourceDate = zoneDateTimeExample.getCurrentTimeByZoneId(sourceZone);
+        ZonedDateTime destDate = zoneDateTimeExample.convertZonedDateTime(sourceDate, destZone);
+        assertTrue(sourceDate.toInstant().compareTo(destDate.toInstant()) == 0);
+    }
+}