UseSimpleDateFormat('dd-MMM-yy') for string date.Format dateFormatter = new SimpleDateFormat("dd-MMM-yy");For above class, do not forget to import the following package, else an error would be visible.import java.text.SimpleDateFormat;Now, parse the date.Date dt = (Date) dateFormatter.parseObject("20-Nov-18");Example Live Demoimport java.text.Format; import java.text.SimpleDateFormat; import java.util.Date; public class Main {    public static void main(String[] argv) throws Exception {       Format dateFormatter = new SimpleDateFormat("dd-MMM-yy");       // parse       Date dt = (Date) dateFormatter.parseObject("20-Nov-18");       System.out.println("Date = "+dt);    } }OutputDate = Tue Nov 20 00:00:00 UTC 2018

To get the time format, use the DateFormat class and create a new object.DateFormat dateFormatter = new SimpleDateFormat("hh.mm.ss a");Now, parse the time.dateFormatter.parse("12.55.20 PM");Example Live Demoimport java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; public class Main {    public static void main(String[] argv) throws Exception {       DateFormat dateFormatter = new SimpleDateFormat("hh.mm.ss a");       System.out.println("Parse Time...");       Date dt = (Date) dateFormatter.parse("12.55.20 PM");       System.out.println(dt);    } }OutputParse Time... Thu Jan 01 12:55:20 UTC 1970

For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Here is the object.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();Now, let us get the past date, using the add() method with a negative value.// past date cal.add((GregorianCalendar.DATE), -1);Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] a) {       GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();       System.out.println("Current date: " + cal.getTime());       // past date       cal.add((GregorianCalendar.DATE), -1);       System.out.println("Modified date (Previous Date): " + cal.getTime());    } }OutputCurrent date: Mon Nov 19 18:01:37 UTC 2018 Modified date (Previous Month): Fri ... Read More

For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();Now, use the following field and add() method with a negative one (-1) to display the previous year.cal.add((GregorianCalendar.YEAR), -1)Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] a) {       GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();       System.out.println("Current date: " + cal.getTime());       // previous year       cal.add((GregorianCalendar.YEAR), -1);       System.out.println("Modified date: " + cal.getTime());    } }OutputCurrent date: Mon Nov 19 18:05:49 UTC 2018 Modified date: Sun Nov 19 18:05:49 UTC 2017

For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Firstly, let us display the current date and time.GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance(); System.out.println("Current date: " + cal.getTime());Now, modify the date. Here we are adding two days to the month using the add() method.cal.add((GregorianCalendar.MONTH), 2);Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] a) {       GregorianCalendar cal = (GregorianCalendar) GregorianCalendar.getInstance();       System.out.println("Current date: " + cal.getTime());       cal.add((GregorianCalendar.MONTH), 2);       System.out.println("Modified date: " + cal.getTime());    } }OutputCurrent date: Mon Nov 19 17:52:55 UTC 2018 Modified date: Sat Jan ... Read More

For GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create an object.GregorianCalendar calendar = new GregorianCalendar();To get the day of the week, use the following field.GregorianCalendar.DAY_OF_WEEKThe following is an example.Example Live Demoimport java.util.Calendar; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] a) {       GregorianCalendar calendar = new GregorianCalendar();       System.out.println("Day of Week = " + calendar.get(GregorianCalendar.DAY_OF_WEEK));       System.out.println("Date = " + calendar.get(GregorianCalendar.DATE));       System.out.println("Month = " + calendar.get(GregorianCalendar.MONTH));       System.out.println("Year = " + calendar.get(GregorianCalendar.YEAR));    } }OutputDay of Week = 2 Date = 19 Month = 10 Year = ... Read More

To work with the GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Firstly, create a GregorianCalendar object.GregorianCalendar calendar = new GregorianCalendar();Now, set the above-created object to a date. Here 0 is for 1st month.calendar.set(2018, 0, 25);The following is an example.Example Live Demoimport java.util.GregorianCalendar; import java.util.Calendar; import java.util.Date; public class Demo {    public static void main(String[] args) {       GregorianCalendar calendar = new GregorianCalendar();       // 0 is for 1st month       calendar.set(2018, 0, 25);       System.out.println("" + calendar.getTime());    } }OutputThu Jan 25 16:51:24 UTC 2018

To work with the GregorianCalendar class, import the following package.import java.util.GregorianCalendar;Create a Date object.Date d = new Date();Now, create an object and set the time using the setTime() method.GregorianCalendar cal = new GregorianCalendar(); cal.setTime(d);The following is an example.Example Live Demoimport java.util.Date; import java.util.GregorianCalendar; public class Demo {    public static void main(String[] a) {       Date d = new Date();       GregorianCalendar cal = new GregorianCalendar();       cal.setTime(d);       System.out.println(d);    } }OutputMon Nov 19 16:11:31 UTC 2018

To specify the TimeZone explicitly, use the getTimeZone() method of the TimeZone class. For Locale and TimeZone, we have imported the following packages.import java.util.Locale; import java.util.TimeZoneLet us specify for timezone America/New_York.GregorianCalendar cal = new GregorianCalendar(TimeZone.getTimeZone("America/New_York"), Locale.US);The following is an example.Example Live Demoimport java.util.GregorianCalendar; import java.util.Locale; import java.util.TimeZone; public class Demo {    public static void main(String[] a) {       GregorianCalendar cal = new GregorianCalendar(TimeZone.getTimeZone("America/New_York"), Locale.US);       System.out.println(cal);    } }Outputjava.util.GregorianCalendar[time=1542643323673, areFieldsSet=true, areAllFieldsSet=true, lenient=true, zone=sun.util.calendar.ZoneInfo[id="America/New_York", offset=-18000000, dstSavings=3600000, useDaylight=true, transitions=235, lastRule=java.util.SimpleTimeZone[id=America/New_York, offset=-18000000, dstSavings=3600000, useDaylight=true, startYear=0, startMode=3, startMonth=2, startDay=8, startDayOfWeek=1, startRead More

GregorianCalendar is a hybrid calendar that supports both the Julian and Gregorian calendar systems with the support of a single discontinuity, which corresponds by default to the Gregorian date when the Gregorian calendar was instituted.The java.util.GregorianCalendar class in Java is a concrete subclass of Calendar and provides the standard calendar system used by most of the world.Import the following package to work with GregorianCalendar class.import java.util.GregorianCalendar;The following are the constructors.Sr.No.Constructor & Description1GregorianCalendar() This constructs a default GregorianCalendar using the current time in the default time zone with the default locale.2GregorianCalendar(int year, int month, int dayOfMonth) This constructs a GregorianCalendar with the given ... Read More