BAEL-3442: Move java files from java-dates to core-java-datetime-java8

core-java-modules/core-java-datetime-java8/src/main/java/com/baeldung/datetime/UseDateTimeFormatter.java

@@ -0,0 +1,21 @@
+package com.baeldung.datetime;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.format.FormatStyle;
+import java.util.Locale;
+
+public class UseDateTimeFormatter {
+    public String formatAsIsoDate(LocalDateTime localDateTime) {
+        return localDateTime.format(DateTimeFormatter.ISO_DATE);
+    }
+
+    public String formatCustom(LocalDateTime localDateTime, String pattern) {
+        return localDateTime.format(DateTimeFormatter.ofPattern(pattern));
+    }
+
+    public String formatWithStyleAndLocale(LocalDateTime localDateTime, FormatStyle formatStyle, Locale locale) {
+        return localDateTime.format(DateTimeFormatter.ofLocalizedDateTime(formatStyle)
+            .withLocale(locale));
+    }
+}

core-java-modules/core-java-datetime-java8/src/main/java/com/baeldung/datetime/UseOffsetDateTime.java

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+package com.baeldung.datetime;
+
+import java.time.LocalDateTime;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+
+public class UseOffsetDateTime {
+    public OffsetDateTime offsetOfLocalDateTimeAndOffset(LocalDateTime localDateTime, ZoneOffset offset) {
+        return OffsetDateTime.of(localDateTime, offset);
+    }
+}

core-java-modules/core-java-datetime-java8/src/test/java/com/baeldung/datetime/UseDateTimeFormatterUnitTest.java

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+package com.baeldung.datetime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.LocalDateTime;
+import java.time.Month;
+import java.time.format.FormatStyle;
+import java.util.Locale;
+
+import org.junit.Test;
+
+public class UseDateTimeFormatterUnitTest {
+    private final UseDateTimeFormatter subject = new UseDateTimeFormatter();
+    private final LocalDateTime localDateTime = LocalDateTime.of(2015, Month.JANUARY, 25, 6, 30);
+
+    @Test
+    public void givenALocalDate_whenFormattingAsIso_thenPass() {
+        String result = subject.formatAsIsoDate(localDateTime);
+
+        assertThat(result).isEqualTo("2015-01-25");
+    }
+
+    @Test
+    public void givenALocalDate_whenFormattingWithPattern_thenPass() {
+        String result = subject.formatCustom(localDateTime, "yyyy/MM/dd");
+
+        assertThat(result).isEqualTo("2015/01/25");
+    }
+
+    @Test
+    public void givenALocalDate_whenFormattingWithStyleAndLocale_thenPass() {
+        String result = subject.formatWithStyleAndLocale(localDateTime, FormatStyle.MEDIUM, Locale.UK);
+
+        assertThat(result).isEqualTo("25 Jan 2015, 06:30:00");
+    }
+}

core-java-modules/core-java-datetime-java8/src/test/java/com/baeldung/datetime/UseOffsetDateTimeUnitTest.java

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+package com.baeldung.datetime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.LocalDateTime;
+import java.time.Month;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+
+import org.junit.Test;
+
+public class UseOffsetDateTimeUnitTest {
+    private final UseOffsetDateTime subject = new UseOffsetDateTime();
+
+    @Test
+    public void givenAZoneOffSetAndLocalDateTime_whenCombing_thenValidResult() {
+        ZoneOffset offset = ZoneOffset.of("+02:00");
+        LocalDateTime localDateTime = LocalDateTime.of(2015, Month.FEBRUARY, 20, 6, 30);
+
+        OffsetDateTime result = subject.offsetOfLocalDateTimeAndOffset(localDateTime, offset);
+
+        assertThat(result.toString()).isEqualTo("2015-02-20T06:30+02:00");
+    }
+}

core-java-modules/core-java-datetime-java8/src/test/java/com/baeldung/datetime/UseToInstantUnitTest.java

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+package com.baeldung.datetime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.LocalDateTime;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+import org.junit.Test;
+
+public class UseToInstantUnitTest {
+
+    private UseToInstant subject = new UseToInstant();
+
+    @Test
+    public void givenAGregorianCalenderDate_whenConvertingToLocalDate_thenAsExpected() {
+        GregorianCalendar givenCalender = new GregorianCalendar(2018, Calendar.JULY, 28);
+
+        LocalDateTime localDateTime = subject.convertDateToLocalDate(givenCalender);
+
+        assertThat(localDateTime).isEqualTo("2018-07-28T00:00:00");
+    }
+
+    @Test
+    public void givenADate_whenConvertingToLocalDate_thenAsExpected() {
+        Date givenDate = new Date(1465817690000L);
+
+        LocalDateTime localDateTime = subject.convertDateToLocalDate(givenDate);
+
+        assertThat(localDateTime).isEqualTo("2016-06-13T13:34:50");
+    }
+}