CreateAndManageDateTimeExample.java

package com.kiroule.ocpupgradejava8.topic8_1;

import java.time.Duration;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.Period;
import java.time.temporal.ChronoField;

/**
 * @author Igor Baiborodine
 */
public class CreateAndManageDateTimeExample {

  public static void main(String... args) {

        /* LocalDate */
    LocalDate specificDate = LocalDate.of(2016, 2, 15);
    System.out.printf("Specific date[2016-02-15]: year[%d], month[%s], day[%s]," +
                      " length of month[%d], leap year[%b]%n",
                      specificDate.getYear(),
                      specificDate.getMonth(),
                      specificDate.getDayOfWeek(),
                      specificDate.lengthOfMonth(),
                      specificDate.isLeapYear());

    LocalDate todayDate = LocalDate.now();
    System.out.printf("Today date: year[%d], month[%d], day[%d]%n",
                      todayDate.get(ChronoField.YEAR),
                      todayDate.get(ChronoField.MONTH_OF_YEAR),
                      todayDate.get(ChronoField.DAY_OF_MONTH));

        /* LocalTime */
    LocalTime specificTime = LocalTime.of(21, 16, 59);
    System.out.printf("Specific time[21:16:59]: hour[%d], minute[%d], second[%d]%n",
                      specificTime.getHour(),
                      specificTime.getMinute(),
                      specificTime.getSecond());

    LocalTime nowTime = LocalTime.now();
    System.out.printf("Now time: hour[%d], minute[%d], second[%d]%n",
                      nowTime.get(ChronoField.HOUR_OF_DAY),
                      nowTime.get(ChronoField.MINUTE_OF_HOUR),
                      nowTime.get(ChronoField.SECOND_OF_MINUTE));

        /* LocalDateTime */
    System.out.printf("Parsing specific date[2015-02-24]: %s %n", LocalDate.parse("2015-02-24"));
    System.out.printf("Parsing specific time[23:54:08]: %s %n", LocalTime.parse("23:54:08"));

    LocalDateTime nowDateTime = LocalDateTime.now();
    System.out.printf("Now date/time: %s %n", nowDateTime);

    LocalDateTime specificDateTime = LocalDateTime.of(1940, Month.JANUARY, 20, 0, 0, 1);
    System.out.printf("Specific date/time 1: %s %n", specificDateTime);
    System.out.printf("Specific date/time 2: %s %n", LocalDateTime.of(specificDate, specificTime));
    System.out.printf("Specific date/time 3: %s %n", specificDate.atTime(specificTime));
    System.out.printf("Specific date/time 4: %s %n", specificTime.atDate(specificDate));


        /* Instant */
    Instant oneBlnInstant = Instant.ofEpochSecond(1_000_000_000);
    System.out.printf("1 Billion seconds since the Unix epoch time," +
                      " midnight of January 1 1970 UTC: %s %n", oneBlnInstant);
    Instant nowInstant = Instant.now();
    System.out.printf("%s seconds since the Unix epoch time to now %n",
                      nowInstant.getEpochSecond());

        /* Duration */
    System.out.printf("Time duration between %s and %s: %s %n",
                      specificTime, nowTime, Duration.between(specificTime, nowTime));
    System.out.printf("Date/Time duration between %s and %s: %s %n",
                      specificDateTime, nowDateTime,
                      Duration.between(specificDateTime, nowDateTime));
    System.out.printf("Instant duration between %s and %s: %s %n",
                      oneBlnInstant, nowInstant, Duration.between(oneBlnInstant, nowInstant));
    // Duration cannot be applied to LocalDate instances
    // (throws java.time.temporal.UnsupportedTemporalTypeExceptionUnsupported unit: Seconds),
    // use Period instead
    // Duration.between(specificDate, todayDate);

        /* Period */
    System.out.printf("Period between %s and %s: %s %n",
                      specificDate, todayDate, Period.between(specificDate, todayDate));
    System.out.printf("Specific period(3 weeks): %s %n", Period.ofWeeks(3));
  }
}