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Java > Java SE, EE, ME > java > util > GregorianCalendar

java.util
Class GregorianCalendar

java.lang.Object
  extended by java.util.Calendar
      extended by java.util.GregorianCalendar
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Calendar>
See Also:
Top Examples, Source Code, setGregorianChange(), TimeZone 
public static final int AD
See Also:
Calendar.ERA
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[191]Create a Calendar with specific date
By Anonymous on 2005/09/14 21:24:15  Rate
Calendar calAD = java.util.GregorianCalendar.getInstance (  ) ; 
 calAD.set (  1999, 1, 23  ) ; 
 System.out.println ( calAD.getTime (  )  ) ;
public void add(int field,
                int amount)
See Also:
Calendar.set(int,int), Calendar.roll(int,int), IllegalArgumentException
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public static final int BC
See Also:
Calendar.ERA
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public Object clone()
See Also:
Cloneable, Calendar
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protected void computeFields()
See Also:
Calendar.complete()
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protected void computeTime()
See Also:
Calendar.computeFields(), Calendar.complete(), IllegalArgumentException
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public boolean equals(Object obj)
See Also:
Calendar.compareTo(Calendar)
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public int getActualMaximum(int field)
See Also:
getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek
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public int getActualMinimum(int field)
See Also:
getActualMaximum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek
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public int getGreatestMinimum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getMaximum(int), getMinimum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek
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public final Date getGregorianChange()
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public int getLeastMaximum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek
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public int getMaximum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMinimum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek, get
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public int getMinimum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), Calendar, getTimeZone, getMinimalDaysInFirstWeek, getFirstDayOfWeek, get
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public TimeZone getTimeZone()
See Also:
Calendar
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public GregorianCalendar()
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[46]Use Date & Time operation of calendar class
By Anonymous on 2003/11/21 12:19:43  Rate
// The `calendar' class contains operations for getting 
 // the day and date from a `Date' object. 
 GregorianCalendar calendar = new GregorianCalendar (  ) ; 
  
  
 // The `setTime' operation sets the time to that contained in the 
 // the specified date object. As a new date object by default 
 // contains the current date and time, the effect of the line 
 // below is to initialize the Calendar obejct to the current 
 // date and time. 
 calendar.setTime  ( new Date (  )  ) ;   
  
  
 //  ( Note that by convention in Java programming, constants 
 // are given names in capital letters ) . This is not 
 // compulsory, but all professional Java programmers do it 
  
  
 int hour = calendar.get ( calendar.HOUR_OF_DAY ) ; 
 int minute = calendar.get ( calendar.MINUTE ) ; 
  
  
 int dayOfWeek = calendar.get ( calendar.DAY_OF_WEEK ) ; 
 int dayOfMonth = calendar.get ( calendar.DAY_OF_MONTH ) ; 
 int month = calendar.get ( calendar.MONTH ) ; 
 

[1242]Classe que demonstra as funcionalidades de GregorianCalendar e SimpleDateFormat
By Anonymous on 2005/01/04 18:42:47  Rate
/* Classe que demonstra as funcionalidades de GregorianCalendar e SimpleDateFormat */ 
  
  
 public class Demonstra  {  
  
  
 public static void main  ( String args [  ]  )   {  
  
  
 /* Aqui instanciamos a classe GregorianCalendar de forma que ela chame o construtor padr??o dela */ 
 GregorianCalendar calendario = new GregorianCalendar (  ) ; 
  
  
 /* Aqui instanciamos a classe SimpleDateFormat passando argumentos para o construtor de forma que ele inicialize os valores atrav??s dos argumentos passados */ 
 SimpleDateFormat data = new SimpleDateFormat ( "dd/MM/yyyy" ) ; 
 SimpleDateFormat hora = new SimpleDateFormat ( "HH:mm" ) ; 
  
  
 /* Aqui chamamos o conhecido m??todo println para exibir nossos dados, na primeira linha fazemos com que o m??todo getTime nos retorne todos os dados, atrav??s da refer??ncia "calendario" para a classe GregorianCalendar */ 
 System.out.println ( "Informa????o completa " + calendario.getTime (  )  ) ; 
  
  
 /* Aqui fazemos com que o valor retornado pelo m??todo getTime seja formatado pelo m??todo format que passar?? uma mensagem ao objeto "data" */ 
 System.out.println ( "Data " + data.format ( calendario.getTime (  )  ) ; 
  
  
 /* Aqui fazemos com que o valor retornado pelo m??todo getTime seja formatado pelo m??todo format que passar?? uma mensagem ao objeto "hora" */ 
 System.out.println ( "Hora " + hora.format ( calendario.getTime (  )  ) ; 
  
  
  }  
  
  
  }  

[1407]_
By aaa on 2005/04/30 21:00:40  Rate
// The `calendar' class contains operations for getting 
 // the day and date from a `Date' object. 
 GregorianCalendar calendar = new GregorianCalendar (  ) ; 
  
  
 // The `setTime' operation sets the time to that contained in the 
 // the specified date object. As a new date object by default 
 // contains the current date and time, the effect of the line 
 // below is to initialize the Calendar obejct to the current 
 // date and time. 
 calendar.setTime  ( new Date (  )  ) ;   
  
  
 //  ( Note that by convention in Java programming, constants 
 // are given names in capital letters ) . This is not 
 // compulsory, but all professional Java programmers do it 
  
  
 int hour = calendar.get ( calendar.HOUR_OF_DAY ) ; 
 int minute = calendar.get ( calendar.MINUTE ) ; 
  
  
 int dayOfWeek = calendar.get ( calendar.DAY_OF_WEEK ) ; 
 int dayOfMonth = calendar.get ( calendar.DAY_OF_MONTH ) ; 
 int month = calendar.get ( calendar.MONTH ) ; 
  
  
 
public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth)
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public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth,
                         int hourOfDay,
                         int minute)
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public GregorianCalendar(int year,
                         int month,
                         int dayOfMonth,
                         int hourOfDay,
                         int minute,
                         int second)
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public GregorianCalendar(Locale aLocale)
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public GregorianCalendar(TimeZone zone)
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public GregorianCalendar(TimeZone zone,
                         Locale aLocale)
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public int hashCode()
See Also:
Hashtable, Object.equals(java.lang.Object), Calendar
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public boolean isLeapYear(int year)
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[878]Check Leap year
By Anonymous on 2005/09/29 07:18:21  Rate
x = isLeapYear ( year ) ;
public void roll(int field,
                 boolean up)
See Also:
Calendar.set(int,int), add(int,int), IllegalArgumentException
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[1096]Short DateFormat
By Anonymous on 2004/11/04 12:40:45  Rate
Calendar expires = new GregorianCalendar (  ) ; 
 DateFormat df = DateFormat.getDateInstance ( DateFormat.SHORT ) ; 
 expires.setTime ( df.parse ( "11/6/2004" )  ) ; 
  
  
 Calendar now = new GregorianCalendar (  ) ; 
 now.setTime ( new Date (  )  ) ; 
 now.roll ( Calendar.DAY_OF_YEAR, 3 ) ; 
  
  
 if  ( expires.before ( now )  )  
   System.out.println ( "Hit it" ) ;
public void roll(int field,
                 int amount)
See Also:
Calendar.set(int,int), add(int,int), roll(int,boolean), IllegalArgumentException, Calendar.complete()
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public void setGregorianChange(Date date)
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[2016]setGregorianChange doesn't seem to work
By JohnRichardHines { at } Yahoo { dot } com on 2011/06/28 13:10:47  Rate
//jdk 1.6_26 and jdk 1.5.9 
 import java.text.DateFormat; 
 import java.util.*; 
 public class SetGregorianChangeDate  {  
  
  
   /** 
    * @param args 
    */ 
   public static void main ( String [  ]  args )   {  
     DateFormat df = DateFormat.getDateInstance (  ) ; 
     df.setTimeZone ( TimeZone.getTimeZone ( "GMT" )  ) ; 
  
  
     GregorianCalendar gc = new GregorianCalendar ( TimeZone.getTimeZone ( "GMT" )  ) ; 
     System.out.println ( "Get default change date in GMT:"  
       + df.format ( gc.getGregorianChange (  ) .getTime (  )  )  ) ;     
     System.out.println ( "Get day before default change date in GMT  ( Expect 11 day gap Oct 4, 1582 ) :"  
       + df.format ( gc.getGregorianChange (  ) .getTime (  )  - 24*60*60*1000 )  ) ; 
      
     gc = new GregorianCalendar ( TimeZone.getTimeZone ( "GMT" )  ) ; 
     gc.set ( 1752, 9 - 1 , 14, 0, 0, 0 ) ; 
     gc.setGregorianChange ( gc.getTime (  )  )  ; 
      
     System.out.println ( "Get new change date in GMT:"  
       + df.format ( gc.getGregorianChange (  )  )  ) ;     
     System.out.println ( "Get new day before default change date in GMT  ( Expect 12 day gap Sep 2, 1752 )  :"  
       + df.format ( gc.getGregorianChange (  ) .getTime (  )  - 24*60*60*1000 )  ) ; 
    }  
  }  
  
  
 Get default change date in GMT:Oct 15, 1582 
 Get day before default change date in GMT  ( Expect 11 day gap Oct 4, 1582 ) :Oct 4, 1582 
 Get new change date in GMT:Sep 14, 1752 
 Get new day before default change date in GMT  ( Expect 12 day gap Sep 2, 1752 )  :Sep 13, 1752 
  
  
 I see the expected 11 day gap for the default time. But, when I try 
 to set the change date to the English change date, I don't see the expected 
 12 day gap. Can't see what I'm doing wrong. Any advice?
public void setTimeZone(TimeZone zone)
See Also:
Calendar
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