[BAEL-7767] Convert-between-ZonedDateTime-and-Date (#16490)

core-java-modules/core-java-datetime-conversion-2/src/main/java/com/baeldung/convertdateandzoneddatetime/DateAndZonedDateTimeConverter.java

@@ -0,0 +1,17 @@
+package com.baeldung.convertdateandzoneddatetime;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Date;
+
+public class DateAndZonedDateTimeConverter {
+
+    public static Date convertToDate(ZonedDateTime zonedDateTime) {
+        return Date.from(zonedDateTime.toInstant());
+    }
+
+    public static ZonedDateTime convertToZonedDateTime(Date date, ZoneId zone) {
+        return date.toInstant().atZone(zone);
+    }
+
+}

core-java-modules/core-java-datetime-conversion-2/src/test/java/com/baeldung/convertdateandzoneddatetime/DateAndZonedDateTimeConverterUnitTest.java

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+package com.baeldung.convertdateandzoneddatetime;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Date;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DateAndZonedDateTimeConverterUnitTest {
+
+    @Test
+    public void givenZonedDateTime_whenConvertToDate_thenCorrect() {
+        ZonedDateTime zdt = ZonedDateTime.now(ZoneId.of("UTC"));
+        Date date = DateAndZonedDateTimeConverter.convertToDate(zdt);
+        assertEquals(Date.from(zdt.toInstant()), date);
+    }
+
+    @Test
+    public void givenDate_whenConvertToZonedDateTime_thenCorrect() {
+        Date date = new Date();
+        ZoneId zoneId = ZoneId.of("UTC");
+        ZonedDateTime zdt = DateAndZonedDateTimeConverter.convertToZonedDateTime(date, zoneId);
+        assertEquals(date.toInstant().atZone(zoneId), zdt);
+    }
+
+}