Examples of java.time.LocalDateTime

java.time.LocalDateTime
A date-time without a time-zone in the ISO-8601 calendar system, such as {@code 2007-12-03T10:15:30}.
{@code LocalDateTime} is an immutable date-time object that represents a date-time,often viewed as year-month-day-hour-minute-second. Other date and time fields, such as day-of-year, day-of-week and week-of-year, can also be accessed. Time is represented to nanosecond precision. For example, the value "2nd October 2007 at 13:45.30.123456789" can be stored in a {@code LocalDateTime}.
This class does not store or represent a time-zone. Instead, it is a description of the date, as used for birthdays, combined with the local time as seen on a wall clock. 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 LocalDateTime} 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

                    Message[] msgs = source.search(st);
                    if (msgs != null && msgs.length > 0) {
                        moveMessages(msgs, source, getFolder(rule.getDestFolder(), Folder.READ_WRITE));
                    }
                } else if (rule.getOlderThan() > 0) {
                    LocalDateTime day = LocalDateTime.now().minusDays(rule.getOlderThan());
                    SentDateTerm term = new SentDateTerm(ComparisonTerm.LE, 
                            Date.from(day.toLocalDate().atStartOfDay().atZone(ZoneId.systemDefault()).toInstant()));
                    Message[] msgs = source.search(term);
                    if (msgs != null && msgs.length > 0) {
                        deleteMessages(msgs, source);
                    }
                }

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 */
public class LocalDateTime1 {


    public static void main(String[] args) {


        LocalDateTime sylvester = LocalDateTime.of(2014, Month.DECEMBER, 31, 23, 59, 59);


        DayOfWeek dayOfWeek = sylvester.getDayOfWeek();
        System.out.println(dayOfWeek);      // WEDNESDAY


        Month month = sylvester.getMonth();
        System.out.println(month);          // DECEMBER


        long minuteOfDay = sylvester.getLong(ChronoField.MINUTE_OF_DAY);
        System.out.println(minuteOfDay);    // 1439


        Instant instant = sylvester
                .atZone(ZoneId.systemDefault())
                .toInstant();


        Date legacyDate = Date.from(instant);
        System.out.println(legacyDate);     // Wed Dec 31 23:59:59 CET 2014




        DateTimeFormatter formatter =
                DateTimeFormatter
                        .ofPattern("MMM dd, yyyy - HH:mm");


        LocalDateTime parsed = LocalDateTime.parse("Nov 03, 2014 - 07:13", formatter);
        String string = parsed.format(formatter);
        System.out.println(string);     // Nov 03, 2014 - 07:13
    }

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   * Date/time classes provide factory methods which follow naming conventions. of() is used to construct date/time from
   * their constituent field, from a year, up to a resolution of nanoseconds.
   */
  @Test
  public void testCreateDateTimeFromConstituentFields() {
    final LocalDateTime localDateTime = LocalDateTime.of(2014, Month.AUGUST, 30, 21, 40, 20);
    // toString() methods return ISO-8601 format representation by default, which is consistent with parsing (see below)
    assertThat(localDateTime.toString(), is("2014-08-30T21:40:20"));
  }

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   */
  @Test
  public void testParseDateTime() {
    // Parse a local (no time zone) date/time string
    // Uses java.time.format.DateTimeFormatter#ISO_LOCAL_DATE_TIME.
    final LocalDateTime localdateTime = LocalDateTime.parse("2014-08-30T21:40:20");
    assertThat(localdateTime, is(LocalDateTime.of(2014, Month.AUGUST, 30, 21, 40, 20)));


    // Parse a date/time string with a time zone, in ISO-8601 format - this one is in UTC, as per the 'Z' zone indicator
    // Uses java.time.format.DateTimeFormatter.ISO_ZONED_DATE_TIME.
    final ZonedDateTime zonedDateTime = ZonedDateTime.parse("2014-08-30T21:40:20Z");

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  public void testGetDateTimeComponentValues() {
    final Month month = Month.AUGUST;
    int dayOfMonth = 31;
    int seconds = 59;


    final LocalDateTime localDateTime = LocalDateTime.of(2014, month, dayOfMonth, 18, 46, seconds);


    assertThat(localDateTime.getMonth(), is(month));
    assertThat(localDateTime.getDayOfMonth(), is(dayOfMonth));
    assertThat(localDateTime.getSecond(), is(seconds));
  }

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   * Date/time classes are immutable. Therefore methods to alter instances of them are named with() rather than being
   * setters, and they return new instances.
   */
  @Test
  public void testAlterDateTimeComponentValues() {
    final LocalDateTime localDateTime = LocalDateTime.of(2014, Month.AUGUST, 30, 19, 02, 58);


    // 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()
    LocalDateTime futureDateTime = localDateTime.plusWeeks(3);
    expectedDate = LocalDate.of(localDateTime.getYear(), Month.SEPTEMBER, 20);
    assertThat(futureDateTime, is(LocalDateTime.of(expectedDate, expectedTime)));
    // Test altering component fields using generic delta method plus(value, Unit)
    futureDateTime = futureDateTime.plus(1, ChronoUnit.WEEKS);
    expectedDate = LocalDate.of(localDateTime.getYear(), Month.SEPTEMBER, 27);
    assertThat(futureDateTime, is(LocalDateTime.of(expectedDate, expectedTime)));
  }

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   * The API supports truncating a Date, Time and DateTime to different precisions. Truncation results in the fields
   * with precisions smaller than the specified unit being set to zero.
   */
  @Test
  public void testTruncationTo() {
    final LocalDateTime localDateTime = LocalDateTime.of(2014, Month.SEPTEMBER, 1, 15, 56, 52, 1);
    // Note - To set seconds and nanoseconds to zero, you truncate the minutes.
    LocalDateTime truncatedDateTime = localDateTime.truncatedTo(ChronoUnit.MINUTES);
    assertThat(truncatedDateTime, is(LocalDateTime.parse("2014-09-01T15:56:00")));
  }

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  public void testDurationToAlterTime() {
    // A duration of 3 seconds and 5 nanoseconds
    Duration duration = Duration.ofSeconds(3, 5);


    // You can modify the values of a DateTime using a Duration
    final LocalDateTime localDateTime = LocalDateTime.of(2014, Month.SEPTEMBER, 1, 17, 29, 40);
    final LocalDateTime futureDateTime = localDateTime.plus(duration);
    assertThat(futureDateTime, is(LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.of(17, 29, 43, 5))));
    // You can also use a Duration to calculate the difference between two times
    assertThat(Duration.between(localDateTime, futureDateTime), is(duration));
  }

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        assertThat(result).isEqualTo(LocalDateTime.of(1970, 1, 1, 1, 0));
    }


    @Test
    public void operationIsSymetric() {
        final LocalDateTime originalDate = LocalDateTime.of(2014, 1, 1, 17, 10, 23);
        final Java8LocalDateTimeConverter converter = new Java8LocalDateTimeConverter();
        final Object serialized = converter.toDbValue(originalDate);
        final Object unserialized = converter.fromDbValue(serialized);


        assertThat(unserialized).isEqualTo(originalDate);

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            if (LHUtils.hashFromPledge(pledge).equals(myPledgeHash))
                msg += " (yours)";
            status.setText(msg);
            email.setText(pledge.getPledgeDetails().getContactAddress());
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
            LocalDateTime time = LocalDateTime.ofEpochSecond(pledge.getTimestamp(), 0, ZoneOffset.UTC);
            date.setText(time.format(formatter));
            memoSnippet.setText(pledge.getPledgeDetails().getMemo());
        }

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