Gregorian Calendar Class With Date and Time in Java

Introduction

The Gregorian Calendar class is a subclass of the Calendar class in Java. It has many constructors and methods in Java. It has its own rules to interpret time information.

Constructors of Gregorian Calendar Class

Gregorian Calendar( )

A default Gregorian Calendar is constructed by this constructor using the current time in the default time zone with the default locale.
Gregorian Calendar(int year, int month, int date)

A Gregorian Calendar is constructed by this constructor with the given date set in the default time zone with the default locale.
Gregorian Calendar(Time Zone zone)

A Gregorian Calendar is constructed by this constructor based on the current time in the given time zone with the default locale.
Gregorian Calendar(Time Zone zone, Locale aLocale)

A Gregorian Calendar is constructed by this constructor based on the current time in the given time zone with the given locale.
Gregorian Calendar(Locale aLocale)

A Gregorian Calendar is constructed by this constructor based on the current time in the given time zone with the given locale.
Gregorian Calendar(int year, int month, int date, int hour, int minute)

A Gregorian Calendar is constructed by this constructor with the given date and time set for the default time zone with the default locale.
Gregorian Calendar(int year, int month, int date, int hour, int minute, int second)

A Gregorian Calendar is constructed by this constructor with the given date and time set for the default time zone with the default locale.

Methods of Gregorian Calendar Class

void add(int field, int amount)

The specified amount of time is added by this method to the given time field.
protected void computeFields( )

The UTC is converted as milliseconds to the time field values by this method.
Protected void computeTime( )

The Calendar is overriden by this method. Time field values are also converted to UTC as milliseconds.
boolean equals(Object obj)

The Gregorian Calendar is compared to an object reference by this method.
int get(int field)

It get the value for a given time field.
int getActualMaximum(int field)

A maximum value is returned by this method that this field could have, given the current date.
int getActualMinimum(int field)

A minimum value is returned by this method that this field could have, given the current date.
int getGreatestMinimum(int field)

A highest minimum value is returned for the given field, if varies.
Date getGregorianChange()

It gets the Gregorian Calendar change date.
int getLeastMaximum(int field)

A lowest maximum value is returned by this method for the given field, if varies.
int getMaximum(int field)

A maximum value is returned by this method for the given field.
Date getTime( )

It gets the Calendar's current time.
long getTimeInMillis( )

It gets the Calendar's current time as a long.
Time Zone getTimeZone( )

It gets the time zone.
int getMinimum(int field)

A minimum value is returned by this method for the given field.
int hashCode( )

The Hash code is overriden by this method.
boolean isLeapYear(int year)

It determines whether the given year is a leap year or not.
void roll(int field, boolean up)

A single unit of time is added or subtracted by this method on the given time field without changing larger fields.
void set(int field, int value)

The time field is set with the given value by this method.
void set(int year, int month, int date)

The values for the fields year, month and date are set by this method.
void set(int year, int month, int date, int hour, int minute)

The values for the fields year, month, date, hour and minute are set by this method.
void set(int year, int month, int date, int hour, int minute, int second)

The values for the fields year, month, date, hour, minute and second are set by this method.
void setGregorianChange(Date date)

The Gregorian Calendar change date is set by this method.
void setTimeInMillis(long millis)

The Calendar's current time is set by this method from the given long value.
void setTimeZone(TimeZone value)

The time zone is set by this method with the given time zone value.
String toString( )

A string representation of the Calendar is returned by this method.
void setTime(Date date)

The Calendar's current time is set by this method with the given date.

Example of Gregorian Calendar Class

package demo;
import java.util.*;
public class Demo
{
public static void main(String args[])
{
String months[] = { "JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL",
"AUG", "SEP", "OCT", "NOV", "DEC" };
int year;
GregorianCalendar Greg_Clndr = new GregorianCalendar();
System.out.print("DATE: ");
System.out.print(months[Greg_Clndr.get(Calendar.MONTH)]);
System.out.print(" " + Greg_Clndr.get(Calendar.DATE) + " ");
System.out.println(year = Greg_Clndr.get(Calendar.YEAR));
System.out.print("TIME: ");
System.out.print(Greg_Clndr.get(Calendar.HOUR) + ":");
System.out.print(Greg_Clndr.get(Calendar.MINUTE) + ":");
System.out.println(Greg_Clndr.get(Calendar.SECOND));
if (Greg_Clndr.isLeapYear(year))
{
System.out.println("LEAP YEAR");
}
else
{
System.out.println("NOT A LEAP YEAR");
}
}
}

Output

Summary

This article explains the Gregorian Calendar class in Java.

Gregorian Calendar Class With Date and Time in Java

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Introduction

Constructors of Gregorian Calendar Class

Methods of Gregorian Calendar Class

Example of Gregorian Calendar Class