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Java Articles
Page 91 of 450
Gregorian Calendar in Java
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 MoreSpecify the TimeZone explicitly for Gregorian Calendar in Java
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.Exampleimport 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, start
Read MoreSet the Date and Time with Gregorian Calendar in Java
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.Exampleimport 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
Read MoreSet a GregorianCalendar object to a particular date in Java
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.Exampleimport 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
Read MoreJava Program to get the day of the week from GregorianCalendar
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.Exampleimport 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 = 2018
Read MoreModify Date and Time from GregorianCalendar in Java
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);Exampleimport 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 19 ...
Read MoreJava Program to display previous year from GregorianCalendar
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)Exampleimport 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
Read MoreParse string date value input in Java
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");Exampleimport 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
Read MoreDisplay Date Time in dd MMM yyyy hh:mm:ss zzz format in Java
Firstly, import the following Java packagesimport java.text.SimpleDateFormat; import java.util.Date;Now, create objectsDate dt = new Date(); SimpleDateFormat dateFormat;Displaying date in the format we want −dateFormat = new SimpleDateFormat("dd MMM yyyy hh:mm:ss zzz");The following is an example −Exampleimport java.text.SimpleDateFormat; import java.util.Date; public class Demo { public static void main(String args[]) { Date dt = new Date(); SimpleDateFormat dateFormat; dateFormat = new SimpleDateFormat("dd MMM yyyy hh:mm:ss zzz"); System.out.println("Date: "+dateFormat.format(dt)); } }OutputDate: 22 Nov 2018 07:53:58 UTC
Read MoreSet a duration in Java
To set a duration, let us declare two objects of Calendar classCalendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance();Set a time for one of the calendar objectsc2.add(Calendar.HOUR, 9); c2.add(Calendar.MINUTE, 15); c2.add(Calendar.SECOND, 40);Now, find the difference between both the time. One would be the current time and another we declared above −long calcSeconds = (c2.getTimeInMillis() - c1.getTimeInMillis()) / 1000;The following is an example −Exampleimport java.util.Calendar; public class Demo { public static void main(String args[]) { Calendar c1 = Calendar.getInstance(); Calendar c2 = Calendar.getInstance(); // set hour, minute and second c2.add(Calendar.HOUR, 9); ...
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