Merge pull request #15285 from Michaelin007/unixtime

Retrieving Unix Time in Java

core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/unixtime/UnixTimeUnitTest.java

@@ -0,0 +1,42 @@
+package com.baeldung.unixtime;
+
+import static org.junit.Assert.assertEquals;
+import java.time.Instant;
+import java.time.LocalDate;
+
+import java.time.Month;
+import java.time.ZoneId;
+import java.util.Date;
+
+import org.joda.time.DateTime;
+
+import org.junit.jupiter.api.Test;
+
+public class UnixTimeUnitTest {
+
+    @Test
+    public void givenTimeUsingDateApi_whenConvertedToUnixTime_thenMatch() {
+        Date date = new Date(2023 - 1900, 1, 15, 0, 0, 0);
+        long expected = 1676419200;
+        long actual = date.getTime() / 1000L;
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenTimeUsingJodaTime_whenConvertedToUnixTime_thenMatch() {
+        DateTime dateTime = new DateTime(2023, 2, 15, 00, 00, 00, 0);
+        long expected = 1676419200;
+        long actual = dateTime.getMillis() / 1000L;
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void givenTimeUsingLocalDate_whenConvertedToUnixTime_thenMatch() {
+        LocalDate date = LocalDate.of(2023, Month.FEBRUARY, 15);
+        Instant instant = date.atStartOfDay().atZone(ZoneId.of("UTC")).toInstant();
+        long expected = 1676419200;
+        long actual = instant.getEpochSecond();
+        assertEquals(expected, actual);
+    }
+
+}