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3. Essential Java Classes 3a. Date and Time in Java SE 8

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Some New Date and Time Classes Package java.time LocalDate - a date without a time-zone in the ISO-8601 calendar system, such as 2007-12-03 LocalTime - a time without time-zone, such as 10:15:30 LocalDateTime - a date-time without a time-zone, such as 2007-12-03T10:15:30 Duration - a time-based amount of time, such as '34.5 seconds‘ Period - a date-based amount of time, such as '2 years, 3 months and 4 days‘

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Some Date Enums java.time.DayOfWeek - a day-of-week, such as 'Tuesday‘ java.time.Month – a month-of-year, such as 'July‘ java.time.temporal.ChronoField – a standard set of fields provide field-based access to manipulate a date, time or date-time java.time.temporal.ChronoUnit – a standard set of date periods units

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LocalDate Class 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 This class does not store or represent a time 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 Gregorian calendar system The LocalDate class doesn’t have a public constructor

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How to Create LocalDate now() - obtains the current date from the system clock in the default time-zone of(int year, int month, int dayOfMonth) -obtains an instance of LocalDate from a year, month and day of(int year, Month month, int dayOfMonth) - obtains an instance of LocalDate from a year, month and day

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Date Formatting format(DateTimeFormatter formatter) method formats the date using the specified formatter Formatter can be created as follows DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd.MM.yyyy"); Details are here:

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Exercise Print current date, please

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Print Current Date See 33a1CurrentDate project for the full text

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LocalDate Comparison Methods compareTo(LocalDate other) - compares this date to another date equals(Object obj) - checks if this date is equal to another date isAfter(LocalDate other) - checks if this date is after the specified date isBefore(LocalDate other) - checks if this date is before the specified date

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LocalDate Check/Length Methods isLeapYear() - checks if the year is a leap year lengthOfMonth() - returns the length of the month represented by this date lengthOfYear() - returns the length of the year represented by this date

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LocalDate Plus Methods plusDays(long daysToAdd) - returns a copy of this LocalDate with the specified number of days added plusMonths(long monthsToAdd) - adds the specified period in months plusWeeks(long weeksToAdd) - adds the specified period in weeks plusYears(long yearsToAdd) – adds the specified period in years

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Exercise Print the following: Current date Date in 6 weeks Date 4 month before Date in 45 days

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Date Manipulations See 33a2DateManipulations project for the full text

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Get Field of a Date (1 of 2) get(ChronoField field) - gets the value of the specified field from this date as an int ChronoField enum is a standard set of date fields: DAY_OF_MONTH, DAY_OF_WEEK, DAY_OF_YEAR, HOUR_OF_DAY, MONTH_OF_YEAR, YEAR, SECOND_OF_DAY etc. See for details:

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Get Field of a Date (2 of 2) getDayOfWeek() - gets the day-of-week field, which is an enum DayOfWeek (MONDAY, TUESDAY, WEDNESDAY etc.) getDayOfMonth() - gets the day-of-month field getDayOfYear() - gets the day-of-year field getMonth() - gets the month-of-year field using the Month enum (JANUARY, FEBRUARY, etc.)

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Exercise Create a method that gets some date and returns next bank day

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Exercise See 33a3NextBankDate project for the full text

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Some Other LocalDate Methods until(LocalDate endDate, ChronoUnit unit) - calculates the amount of time until endDate in terms of the specified unit withDayOfMonth(int dayOfMonth) - returns a copy of this date with the day-of-month altered withMonth(int month) - returns a copy of this date with the month-of-year altered withYear(int year) - returns a copy of this date with the year altered

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Home Tasks How old are you in days and months? What day of week is your birthday? Calculate Orthodox Easter and Trinity dates for the current decade

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LocalDateTime Class LocalDateTime is an immutable date-time object that represents a date-time, often viewed as year-month-day-hour-minute-second Time is represented to nanosecond precision 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

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LocalDateTime Methods I now() compareTo(), equals(), isAfter(), isBefore() plusDays(), plusMonths(), plusWeeks(), plusYears() plusHours(), plusMinutes(), plusSeconds() get(ChronoField field), getDayOfWeek(), getDayOfMonth(), getDayOfYear(), getMonth() getHour(), getMinute(), getSecond()

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LocalDateTime Methods II of(int year, int month, int dayOfMonth, int hour, int minute, int second) - obtains an instance of LocalDateTime from year, month, day, hour, minute and second, setting the nanosecond to zero format(DateTimeFormatter formatter) - formats this date-time using the specified formatter

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Print Current Date and Time public static void main(String[] args){ LocalDateTime currDateTime = LocalDateTime.now(); DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss"); String txt = currDateTime.format(formatter); System.out.println("Current date and time:" + txt); } See 33a6CurrentDateTime project for the full text

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Converting from java.util.Date Convert java.util.Date to java.time.LocalDateTime: Date ts = new Date(); Instant instant = Instant.ofEpochMilli(ts.getTime()); LocalDateTime res = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()); Convert java.util.Date to java.time.LocalDate: Date date = new Date(); Instant instant = Instant.ofEpochMilli(date.getTime()); LocalDate res = LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate();

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Converting to java.util.Date Convert java.time.LocalDateTime to java.util.Date: LocalDateTime ldt = LocalDateTime.now(); Instant instant = ldt.atZone(ZoneId.systemDefault()).toInstant(); Date res = Date.from(instant); Convert java.time.LocalDate to java.util.Date: LocalDate ld = LocalDate.now();; Instant instant = ld.atStartOfDay(). atZone(ZoneId.systemDefault()).toInstant(); Date res = Date.from(instant);