Examples of java.time.LocalDate

java.time.LocalDate
A date without a time-zone in the ISO-8601 calendar system, such as {@code 2007-12-03}.
{@code LocalDate} is an immutable date-time object that represents a date,often viewed as year-month-day. Other date fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. For example, the value "2nd October 2007" can be stored in a {@code LocalDate}.
This class does not store or represent a time or time-zone. Instead, it is a description of the date, as used for birthdays. It cannot represent an instant on the time-line without additional information such as an offset or time-zone.
The ISO-8601 calendar system is the modern civil calendar system used today in most of the world. It is equivalent to the proleptic Gregorian calendar system, in which today's rules for leap years are applied for all time. For most applications written today, the ISO-8601 rules are entirely suitable. However, any application that makes use of historical dates, and requires them to be accurate will find the ISO-8601 approach unsuitable.
This is a value-based class; use of identity-sensitive operations (including reference equality ( {@code ==}), identity hash code, or synchronization) on instances of {@code LocalDate} may have unpredictable results and should be avoided.The {@code equals} method should be used for comparisons. @implSpec This class is immutable and thread-safe. @since 1.8

    Integer result = treble.apply(7);


    BinaryOperator<Integer> add = (a,b) -> a + b;
    Integer three = add.apply(1,2);


    LocalDate today = LocalDate.now();
    Function<LocalDate, String> tomorrow = d -> d.plusDays(1).getDayOfWeek().name();


    // Is UnaryOperator<Integer> a Function<Integer,Integer> ?


    BiFunction<LocalDate, LocalDate, Long> daysBetween =

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            if (type == LocalDateTime.class) {
                LocalDateTime localDateTime = LocalDateTime.parse(text);


                return (T) localDateTime;
            } else if (type == LocalDate.class) {
                LocalDate localDate = LocalDate.parse(text);


                return (T) localDate;
            } else if (type == LocalTime.class) {
                LocalTime localDate = LocalTime.parse(text);

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        try (PersistenceSession session = persistenceManager.createSession()) {
            JavatimeConvertEntity inst = new JavatimeConvertEntity();
            inst.setId(99);
            OffsetDateTime dt = OffsetDateTime.ofInstant(new Date().toInstant(), ZoneOffset.of("+0200"));
            LocalDateTime ldt = dt.toLocalDateTime();
            LocalDate ld = ldt.toLocalDate();
            inst.setDateTime(dt);
            inst.setLocalDate(ld);
            inst.setLocalDateTime(ldt);
            session.insert(inst);

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  }
  
  @Override
  public void handle(ActionEvent arg0) {
    List<Object> arg = new LinkedList<Object>();
    LocalDate from = ((DatePicker)args.get(0)).getValue();
    LocalDate to = ((DatePicker)args.get(1)).getValue();
    
    if (from == null || to == null) {
      results.appendText("undefined from date or to date\n");
      return;
    }
    if (from.compareTo(to) >= 0) {
      results.appendText("from date >= to date\n");
      return;
    }
    
    arg.add(from.toString()); arg.add(to.toString());
    try {
      SQLQuery query = new HistorySearchQuery(connect, results);
      query.prepareQuery(arg);
      query.doQuery();
      query.close();

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  }


  @Override
  public void handle(ActionEvent arg0) {
    List<Object> arg = new LinkedList<Object>();
    LocalDate from = ((DatePicker) args.get(0)).getValue();
    LocalDate to = ((DatePicker) args.get(1)).getValue();
    if (from == null || to == null) {
      results.appendText("undefined from date or to date\n");
      return;
    }
    if (from.compareTo(to) >= 0) {
      results.appendText("from date >= to date\n");
      return;
    }
    arg.add(from.toString()); arg.add(to.toString());
    try {
      SQLQuery query = new IncomeCalcQuery(connect, results);
      query.prepareQuery(arg);
      query.doQuery();
      query.close();

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 * @author Benjamin Winterberg
 */
public class LocalDate1 {


    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        LocalDate tomorrow = today.plus(1, ChronoUnit.DAYS);
        LocalDate yesterday = tomorrow.minusDays(2);


        System.out.println(today);
        System.out.println(tomorrow);
        System.out.println(yesterday);


        LocalDate independenceDay = LocalDate.of(2014, Month.JULY, 4);
        DayOfWeek dayOfWeek = independenceDay.getDayOfWeek();
        System.out.println(dayOfWeek);    // FRIDAY


        DateTimeFormatter germanFormatter =
                DateTimeFormatter
                        .ofLocalizedDate(FormatStyle.MEDIUM)
                        .withLocale(Locale.GERMAN);


        LocalDate xmas = LocalDate.parse("24.12.2014", germanFormatter);
        System.out.println(xmas);   // 2014-12-24




    }

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    // Test altering component fields with literal values using withXXX()
    int pastYear = 2013;
    int pastDayOfMonth = 1;
    final LocalDateTime pastDateTime = localDateTime.withYear(pastYear).withDayOfMonth(pastDayOfMonth);
    // Construct separate LocalDate and Time from supplied component values, and time component of existing DateTime
    LocalDate expectedDate = LocalDate.of(pastYear, localDateTime.getMonth(), pastDayOfMonth);
    final LocalTime expectedTime = localDateTime.toLocalTime();
    // A LocalDateTime can be constructed from separate LocalDate and LocalTime
    assertThat(pastDateTime, is(LocalDateTime.of(expectedDate, expectedTime)));


    // Test altering component fields using delta method plusXXX()

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    final Period period = Period.of(3, 2, 1);
    // Components of a Period are represented by ChronoUnit values
    assertThat(period.get(ChronoUnit.DAYS), is(1L));


    // You can modify the values of a Date using a Period
    final LocalDate localDate = LocalDate.of(2014, Month.SEPTEMBER, 1);
    final LocalDate futureDate = localDate.plus(period);
    assertThat(futureDate, is(LocalDate.of(2017, Month.NOVEMBER, 2)));
    // You can also use a Period to calculate the difference between two dates
    assertThat(Period.between(localDate, futureDate), is(period));


    final LocalDate pastDate = localDate.minus(period);
    assertThat(pastDate, is(LocalDate.of(2011, Month.JUNE, 30)));
  }

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   * {@link java.time.MonthDay} is a holder for an associated month and day, such as a birthday.
   */
  @Test
  public void testMonthDayHolder() {
    final MonthDay birthday = MonthDay.of(Month.SEPTEMBER, 1);
    final LocalDate localDate = LocalDate.of(2014, birthday.getMonthValue(), birthday.getDayOfMonth());


    assertThat(localDate.getMonth(), is(birthday.getMonth()));
  }

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   * {@link java.time.YearMonth} is a holder for an associated year and month, such as that used for expiry dates.
   */
  @Test
  public void testYearMonthHolder() {
    final YearMonth expiry = YearMonth.of(2014, Month.SEPTEMBER);
    final LocalDate localDate = LocalDate.of(expiry.getYear(), expiry.getMonthValue(), 1);


    assertThat(localDate.getMonth(), is(expiry.getMonth()));
  }

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