Convert between LocalDateTime and ZonedDateTime - BAEL-5879 (#13057)

* Creating a Deep vs Shallow Copy of an Object in Java

* completed tests for LinkedHashSet

* update

* updated PR

* swapped the order of arguments for assertEquals()

* completed code for Convert between LocalDateTime and ZonedDateTime

* fixed module name

* update

* update

* added more assertions

* update

* added more example

* update

* jenkin build error fix

* jenkin build error fix

* jenkins build fix

* fixed suggested comments

* update

* update

core-java-modules/core-java-datetime-conversion/src/test/java/com/baeldung/localdatetimetozoneddatetime/LocalDateTimeToZonedDateTimeUnitTest.java

@@ -0,0 +1,89 @@
+import org.junit.jupiter.api.Test;
+
+import java.time.*;
+
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+
+public class LocalDateTimeToZonedDateTimeUnitTest {
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithAtZoneMethod_shouldConvertAndMaintainDateTimeValues(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 1, 1, 0, 30, 22);
+        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of("Canada/Atlantic"));
+
+        assertEquals(localDateTime.getYear(), zonedDateTime.getYear());
+        assertEquals(localDateTime.getMonth(), zonedDateTime.getMonth());
+        assertEquals(localDateTime.getDayOfMonth(), zonedDateTime.getDayOfMonth());
+        assertEquals(localDateTime.getHour(), zonedDateTime.getHour());
+        assertEquals(localDateTime.getMinute(), zonedDateTime.getMinute());
+        assertEquals(localDateTime.getSecond(), zonedDateTime.getSecond());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithAtZoneAndwithZoneSameInstantMethods_shouldConvert(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 1, 1, 0, 30, 22);
+        ZonedDateTime zonedDateTime = localDateTime.atZone(ZoneId.of("Africa/Lagos")).withZoneSameInstant(ZoneId.of("Canada/Atlantic"));
+
+        assertEquals("2021-12-31T19:30:22-04:00[Canada/Atlantic]", zonedDateTime.toString());
+        assertEquals("-04:00", zonedDateTime.getOffset().toString());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithOfMethod_shouldConvert(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 11, 5, 7, 30, 22);
+        ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, ZoneId.of("Africa/Accra")).withZoneSameInstant(ZoneId.of("Africa/Lagos"));
+
+        assertEquals("2022-11-05T08:30:22+01:00[Africa/Lagos]", zonedDateTime.toString());
+        assertEquals(localDateTime.getYear(), zonedDateTime.getYear());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithOfInstantMethod_shouldConvert(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 1, 5, 17, 30, 22);
+        ZoneId zoneId = ZoneId.of("Africa/Lagos");
+        ZoneOffset zoneOffset = zoneId.getRules().getOffset(localDateTime);
+        ZonedDateTime zonedDateTime = ZonedDateTime.ofInstant(localDateTime, zoneOffset, zoneId);
+
+        assertEquals("2022-01-05T17:30:22+01:00[Africa/Lagos]", zonedDateTime.toString());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithOfLocalMethod_shouldConvert(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 8, 25, 8, 35, 22);
+        ZoneId zoneId = ZoneId.of("Africa/Lagos");
+        ZoneOffset zoneOffset = zoneId.getRules().getOffset(localDateTime);
+        ZonedDateTime zonedDateTime = ZonedDateTime.ofLocal(localDateTime, zoneId, zoneOffset);
+
+        assertEquals("2022-08-25T08:35:22+01:00[Africa/Lagos]", zonedDateTime.toString());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithOfStrictMethod_shouldConvert(){
+        LocalDateTime localDateTime = LocalDateTime.of(2002, 12, 25, 6, 18, 2);
+        ZoneId zoneId = ZoneId.of("Asia/Tokyo");
+        ZoneOffset zoneOffset = zoneId.getRules().getOffset(localDateTime);
+        ZonedDateTime zonedDateTime = ZonedDateTime.ofStrict(localDateTime, zoneOffset, zoneId);
+
+        assertEquals("2002-12-25T06:18:02+09:00[Asia/Tokyo]", zonedDateTime.toString());
+    }
+
+    @Test
+    void whenConvertLocalDateTimeToZonedDateTimeWithInvalidZoneOffSet_shouldThrowDateTimeException(){
+        LocalDateTime localDateTime = LocalDateTime.of(2022, 12, 25, 6, 18, 2);;
+        ZoneId zoneId = ZoneId.of("Asia/Tokyo");
+        ZoneOffset zoneOffset = ZoneOffset.UTC;
+        assertThrows(DateTimeException.class, () -> ZonedDateTime.ofStrict(localDateTime, zoneOffset, zoneId));
+    }
+
+
+    @Test
+    void whenConvertZonedDateTimeToLocalDateTimeWithToLocalDateTimeMethod_shouldConvert(){
+        ZonedDateTime zonedDateTime = ZonedDateTime.of(2011, 2, 12, 6, 14, 1, 58086000, ZoneId.of("Asia/Tokyo"));
+        LocalDateTime localDateTime = zonedDateTime.toLocalDateTime();
+
+        assertEquals("2011-02-12T06:14:01.058086+09:00[Asia/Tokyo]", zonedDateTime.toString());
+    }
+}