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3. Essential Java Classes 3. Date and Time

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Date and Time Classes Date - represents a specific instant in time, with millisecond precision GregorianCalendar (concrete subclass of Calendar) – date and time manipulations SimpleDateFormat- formatting and parsing dates in a locale-sensitive manner Locale - represents a specific geographical, political, or cultural region SimpleTimeZone(concrete subclass of TimeZone) - represents a time zone for use with a Gregorian calendar

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Class Date represents a specific instant in time, with millisecond precision new Date() returns current date and time Date saves the milliseconds since January 1, 1970, 00:00:00 Date does not localized. Most of it methods are deprecated. Calendar class allows to process dates

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Some Date methods equals(Object obj) - compares dates after(Date date) - compares dates before(Date date) - compares dates getTime() – returns milliseconds since 01.01.1970 setTime() – sets date and time See for details

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Class Calendar Abstract class that provides methods for converting between a specific instant in time and a set of calendar fields Some calendar fields: YEAR, MONTH, DATE, DAY_OF_WEEK, HOUR_OF_DAY, MINUTE, SECOND, MILLISECOND

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Calendar Methods Calendar rightNow = Calendar.getInstance(); - gets current date and time set(int field, int value) – sets calendar field value (then one of get (), getTime(), add(), roll() methods is needed) add(int field, int amount) – adds given amount to the field get(int field) – gets a given field value See for details

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Class GregorianCalendar Concrete subclass of Calendar Provides the standard calendar system used by most of the world. Use GregorianCalendar for date and time manipulations See for details

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Calendar Examples Задание даты: GregorianCalendar calendar = new GregorianCalendar(2012, Calendar.May, 14); Добавление к дате двух недель: calendar.add(Calendar.WEEK_OF_YEAR, 2); Изменение полей даты: calendar.set(Calendar.DAY_OF_MONTH, 10); calendar.set(Calendar.MONTH, Calendar.SEPTEMBER); System.out.println(dtFrm.format(calendar.getTime()));

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Date & Calendar Transformations Calendar c = Calendar.getInstance(); Date dt = new Date(); Calendar -> Date dt = c.getTime(); Date -> Calendar c.setTime(dt);

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Class SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner It allows for: formatting (date -> text) parsing (text -> date) See for details

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SimpleDateFormat Example SimpleDateFormat dtFrm = new SimpleDateFormat("dd.MM.yyyy"); Date start = new Date(); String txDate = dtFrm.format(start);

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Class Locale represents a specific geographical, political, or cultural region Locale lc = new Locale(”uk”, ”UK”); Locale.getDefault() - gets the current value of the default locale See for details

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Класс SimpleTimeZone A concrete subclass of TimeZone class that represents a time zone for use with a Gregorian calendar Can specify the year when the daylight saving time schedule starts or ends. See for details

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SimpleDateFormat Localization SimpleDateFormat dtFrmL = new SimpleDateFormat("dd.MMMM.yyyy", Locale.ENGLISH); Date dt = new Date(); System.out.println("Locale.ENGLISH: " + dtFrmL.format(dt)); Locale.ENGLISH: 05.October.2013 Locale.GERMAN: 05.Oktober.2013 Locale.FRANCE: 05.octobre.2013 Locale.ITALIAN: 05.ottobre.2013 Locale("ua", "ua"): 05.October.2013 Locale("ru", "ru"): 05.Октябрь.2013

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DateFormat Localization DateFormat dtFrmD = DateFormat.getDateInstance(DateFormat.DEFAULT, Locale.ENGLISH); System.out.println("Locale.ENGLISH: " + dtFrmD.format(dt)); Locale.ENGLISH: Oct 5, 2013 Locale.GERMAN: 05.10.2013 Locale.FRANCE: 5 oct. 2013 Locale.ITALIAN: 5-ott-2013 Locale("ua", "ua"): Saturday, October 5, 2013 Locale("ru", "ru"): 5 Октябрь 2013 г.