#BAEL-16646 Start splitting Java dates articles regarding Java 8.
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package com.baeldung.dateapi;
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import java.time.Instant;
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import java.time.ZoneId;
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import java.time.ZonedDateTime;
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import java.util.Date;
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import java.util.GregorianCalendar;
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import java.util.TimeZone;
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public class ConversionExample {
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public static void main(String[] args) {
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Instant instantFromCalendar = GregorianCalendar.getInstance().toInstant();
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ZonedDateTime zonedDateTimeFromCalendar = new GregorianCalendar().toZonedDateTime();
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Date dateFromInstant = Date.from(Instant.now());
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GregorianCalendar calendarFromZonedDateTime = GregorianCalendar.from(ZonedDateTime.now());
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Instant instantFromDate = new Date().toInstant();
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ZoneId zoneIdFromTimeZone = TimeZone.getTimeZone("PST").toZoneId();
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}
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}
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@@ -1,89 +0,0 @@
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package com.baeldung.dateapi;
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import org.junit.Test;
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import java.text.ParseException;
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import java.time.Duration;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.LocalTime;
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import java.time.Month;
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import java.time.YearMonth;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.ChronoUnit;
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import static org.assertj.core.api.Assertions.assertThat;
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public class JavaUtilTimeUnitTest {
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@Test
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public void currentTime() {
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final LocalDate now = LocalDate.now();
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System.out.println(now);
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// there is not much to test here
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}
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@Test
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public void specificTime() {
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LocalDate birthDay = LocalDate.of(1990, Month.DECEMBER, 15);
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System.out.println(birthDay);
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// there is not much to test here
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}
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@Test
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public void extractMonth() {
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Month month = LocalDate.of(1990, Month.DECEMBER, 15).getMonth();
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assertThat(month).isEqualTo(Month.DECEMBER);
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}
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@Test
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public void subtractTime() {
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LocalDateTime fiveHoursBefore = LocalDateTime.of(1990, Month.DECEMBER, 15, 15, 0).minusHours(5);
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assertThat(fiveHoursBefore.getHour()).isEqualTo(10);
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}
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@Test
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public void alterField() {
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LocalDateTime inJune = LocalDateTime.of(1990, Month.DECEMBER, 15, 15, 0).with(Month.JUNE);
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assertThat(inJune.getMonth()).isEqualTo(Month.JUNE);
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}
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@Test
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public void truncate() {
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LocalTime truncated = LocalTime.of(15, 12, 34).truncatedTo(ChronoUnit.HOURS);
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assertThat(truncated).isEqualTo(LocalTime.of(15, 0, 0));
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}
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@Test
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public void getTimeSpan() {
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LocalDateTime now = LocalDateTime.now();
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LocalDateTime hourLater = now.plusHours(1);
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Duration span = Duration.between(now, hourLater);
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assertThat(span).isEqualTo(Duration.ofHours(1));
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}
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@Test
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public void formatAndParse() throws ParseException {
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LocalDate someDate = LocalDate.of(2016, 12, 7);
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
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String formattedDate = someDate.format(formatter);
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LocalDate parsedDate = LocalDate.parse(formattedDate, formatter);
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assertThat(formattedDate).isEqualTo("2016-12-07");
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assertThat(parsedDate).isEqualTo(someDate);
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}
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@Test
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public void daysInMonth() {
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int daysInMonth = YearMonth.of(1990, 2).lengthOfMonth();
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assertThat(daysInMonth).isEqualTo(28);
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}
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}
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