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

java.util
Class Calendar

java.lang.Object
  extended by java.util.Calendar
All Implemented Interfaces:
Serializable, Cloneable, Comparable<Calendar>
Direct Known Subclasses:
GregorianCalendar
See Also:
Top Examples, Source Code, GregorianCalendar.roll(int, int), calendar fields, System.currentTimeMillis(), Date, TimeZone, DateFormat 
public abstract void add(int field,
                         int amount)
See Also:
set(int,int), roll(int,int)
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[222]Calendar addition
By Anonymous on 2005/09/27 05:59:10  Rate
Calendar calADD = java.util.GregorianCalendar.getInstance (  ) ; 
 System.out.println (  calADD.getTime (  )   ) ; 
 

[481]_
By Thorkil Blumensaadt on 2005/09/27 05:58:52  Rate
Calendar c = Calendar.getInstance (  ) ; 
  
  
 c.add ( Calendar.MONTH, 1 ) ;

[683]_
By Anonymous on 2005/06/02 23:07:25  Rate
Calendar c = Calendar.getInstance (  ) ;  
  
  
 c.add ( Calendar.MONTH, 1 ) ; 
 

[830]_
By Ajay on 2005/06/02 06:07:35  Rate
Calendar calADD = java.util.GregorianCalendar.getInstance (  ) ; 
 System.out.println (  calADD.getTime (  )  + " Time After 10 days will be :" +   
 calADD.add ( Calender.Date, 10 )   ) ;

[1789]Yesterday's DAY_OF_YEAR
By Anonymous on 2006/07/21 16:09:10  Rate
import java.util.*; 
 public class jDate  {  
   public static void main ( String args [  ]  )  
    {  
     // Get the Julian day of the year for the report dates 
     Calendar cal = Calendar.getInstance (  ) ; // Get instance of calendar object 
     int today = cal.get ( Calendar.DAY_OF_YEAR ) ; // Get today's number of day in the year 
     System.out.println ( "Today: " + today ) ; 
     cal.add ( Calendar.DAY_OF_YEAR, -1 ) ; // Move to yesterday 
     int yesterday = cal.get ( Calendar.DAY_OF_YEAR ) ; // Get yesterday's number of day in the year 
     System.out.println ( "Yesterday: " + yesterday ) ; 
     cal.add ( Calendar.DAY_OF_YEAR, -6 ) ; // Move to a week before today  ( already moved to yesterday )  
     int lastWeek = cal.get ( Calendar.DAY_OF_YEAR ) ; // Get a week before today's number of day in the year 
     System.out.println ( "Last week: " + lastWeek ) ; 
    }   // End main 
  }   // End userEmails 
 
public boolean after(Object when)
See Also:
compareTo(Calendar)
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[913]Compare Calendar
By Anonymous on 2005/06/30 17:33:16  Rate
The 'after' & 'before' methods take the 'Object' as its input parameter, but in fact it must be a Calendar object, it can not be anyother type, like java.util.Date.

[1536]_
By Nicole Best on 2005/09/13 23:05:04  Rate
Calendar timeNow = Calendar.getInstance (  ) ; // Time now 
 Calendar timeLater = Calendar.getInstance (  ) ; // Time in future 
 timeLater.add ( Calendar.SECOND, 5 ) ; 
 SimpleDateFormat dateFormat = new SimpleDateFormat ( "HH:mm:ss" ) ; 
  
  
 System.out.println ( "Check: is " + dateFormat.format ( timeNow.getTime (  )  )  + " after ( " + dateFormat.format ( timeLater.getTime (  )  )  + " ) " ) ; 
  
  
 // Example of method in use 
 boolean result = timeNow.after ( timeLater ) ;  
 System.out.println ( "Result: " + result ) ;

[1860]Iterating in a date range (from a start date to an end date inclusive)
By Kai Middleton on 2007/01/09 12:49:25  Rate
SimpleDateFormat sdf = new SimpleDateFormat ( "yyyy-MM-dd HH:mm:SS" ) ; 
 Calendar startCal = Calendar.getInstance (  ) ; 
 Calendar endCal = Calendar.getInstance (  ) ; 
 startCal.setTime ( new Date ( 1170000000000L )  ) ; // 2007-01-28 08:00:00 
 endCal.setTime ( new Date ( 1170000000000L )  ) ; // 2007-02-01 08:00:00 
 endCal.add ( Calendar.DAY_OF_YEAR, 4 ) ; 
 System.out.println ( sdf.format ( startCal.getTime (  )  )  + " = startDate" ) ; 
 System.out.println ( sdf.format ( endCal.getTime (  )  )  + " = endDate" ) ; 
 System.out.println ( "----------------------------" ) ; 
  
  
 for  ( Calendar c = startCal; c.compareTo ( endCal )   < = 0; c.add (  
     Calendar.DAY_OF_YEAR, 1 )  )  
   System.out.println ( sdf.format ( c.getTime (  )  )  ) ; 
  
  
  
 result: 
  
  
 2007-01-28 08:00:00 = startDate 
 2007-02-01 08:00:00 = endDate 
 ---------------------------- 
 2007-01-28 08:00:00 
 2007-01-29 08:00:00 
 2007-01-30 08:00:00 
 2007-01-31 08:00:00 
 2007-02-01 08:00:00 
  
  
 Note that the start and end dates have to match down to the millisecond in order for the comparison to work properly. Otherwise the end date might not be included.
public static final int AM
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public static final int AM_PM
See Also:
HOUR, PM, AM
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public static final int APRIL
See Also:
MONTH
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protected boolean areFieldsSet
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public static final int AUGUST
See Also:
MONTH
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public boolean before(Object when)
See Also:
compareTo(Calendar)
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protected Calendar()
See Also:
TimeZone.getDefault()
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[689]Correct way to calculate endDate string
By Anonymous on 2004/12/23 12:11:00  Rate
 String startDate = "02/01/04"; 
 /* MM edit 03/05/2004 correct way to calculate endDate string, makes it leap year independent */ 
     SimpleDateFormat sdf = new SimpleDateFormat ( "mm/dd/yyyy" )  ; 
     Date dStartDate = sdf.parse ( startDate ) ; 
     Calendar stCal = Calendar.getInstance (  ) ; 
     stCal.setTime ( dStartDate ) ; 
     /* endCal is cal2 + 1 month - 1 day */ 
     Calendar endCal = Calendar.getInstance (  ) ; 
     endCal = stCal.add ( Calendar.MONTH,1 ) ; 
     endCal = endCal.add ( Calendar.DAY_OF_MONTH,-1 ) ; 
     String endDate = endCal.toString (  ) ;

[960]_
By Anonymous on 2005/02/28 12:12:36  Rate
endCal = stCal.add ( Calendar.MONTH,1 ) ;  
 cannot work since  
 stCal.add ( Calendar.MONTH,1 ) ; sends void back 
 so do endCal = stCal.add; 
 in a second step !

[1473]_
By Hemanth Kumar on 2005/07/06 19:57:52  Rate
//setting the month to February 
 calendar.set ( Calendar.MONTH,1 ) ; 
 calendar.set ( Calendar.DATE,1 ) ; 
 calendar.add ( Calendar.MONTH,1 ) ; 
 calendar.add ( Calendar.DAY_OF_MONTH,-1 ) ; 
  
  
 System.out.println ( "End Date" + calendar.getTime (  )  ) ;
protected Calendar(TimeZone zone,
                   Locale aLocale)
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public final void clear()
See Also:
clear(int), isSet()
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[1331]Behaviour of Calendar Clear
By Anonymous on 2005/03/08 14:21:22  Rate
After the 'clear (  ) ' is called, the time value of this Calendar is  
 undefined as stated in the JavaDoc. You need to call BOTH clear 
  ( Calendar.HOUR )  AND clear ( Calendar.HOUR_OF_DAY )  to reliably set the  
 time portion of a Calendar object to 0:0:0.0, calling only one of  
 these is insufficient.  
 
public final void clear(int field)
See Also:
clear(), set(Calendar.HOUR_OF_DAY, 0), AM_PM, HOUR, HOUR_OF_DAY, isSet(field)
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public Object clone()
See Also:
Cloneable
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public int compareTo(Calendar anotherCalendar)
See Also:
IllegalArgumentException, NullPointerException, Comparable, compareTo
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protected void complete()
See Also:
computeFields(), computeTime()
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protected abstract void computeFields()
See Also:
computeTime(), complete(), fields[], time
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protected abstract void computeTime()
See Also:
computeFields(), complete(), time, fields[]
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public static final int DATE
See Also:
DAY_OF_MONTH
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public static final int DAY_OF_MONTH
See Also:
DATE
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[625]Calculate No. of days in a month
By Babu on 2005/01/19 06:33:11  Rate
Calendar Today = new GregorianCalendar (  ) ;     
 System.out.println ( "No. of days in this month = " + Today.getActualMaximum ( Calendar.DAY_OF_MONTH )  ) ; 
 

[917]Month is Zero-Based
By Harischandra Valisetty on 2004/09/22 03:07:48  Rate
Month is Zero-Based. E.g., January is 0 and December is 11
public static final int DAY_OF_WEEK
See Also:
SATURDAY, FRIDAY, THURSDAY, WEDNESDAY, TUESDAY, MONDAY, SUNDAY
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[1805]Retrieving the DAY_OF_WEEK from a Calendar object
By Anonymous on 2006/08/09 17:55:28  Rate
int currentDayOfWeek = Calendar.getInstance (  ) .get ( Calendar.DAY_OF_WEEK ) ;
public static final int DAY_OF_WEEK_IN_MONTH
See Also:
WEEK_OF_MONTH, DAY_OF_WEEK
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public static final int DAY_OF_YEAR
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public static final int DECEMBER
See Also:
MONTH
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public static final int DST_OFFSET
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public boolean equals(Object obj)
See Also:
Hashtable, Object.hashCode(), compareTo
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public static final int ERA
See Also:
GregorianCalendar.BC, GregorianCalendar.AD
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public static final int FEBRUARY
See Also:
MONTH
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protected int[] fields
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public static final int FIELD_COUNT
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public static final int FRIDAY
See Also:
DAY_OF_WEEK
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[1378]FRIDAY value
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:19:40  Rate
System.out.println ( "In current Year, this week's FRIDAY is the " + Calendar.FRIDAY + "th" ) ;
public int get(int field)
See Also:
complete(), set(int,int), ArrayIndexOutOfBoundsException
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public int getActualMaximum(int field)
See Also:
getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int)
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[626]Calculate No. of days in a year
By Babu on 2004/01/23 09:12:14  Rate
Calendar Today = new GregorianCalendar (  ) ;     
 System.out.println ( "No. of days in this month = " + Today.getActualMaximum ( Calendar.DAY_OF_MONTH )  ) ; 
 System.out.println ( "No. of days in this year = " + Today.getActualMaximum ( Calendar.DAY_OF_YEAR )  ) ;

[1128]Chack validity of a date
By Khurram Chaudhry on 2004/11/19 21:49:14  Rate
Chack validity of a date 
  
  
 public boolean isDateValid ( GregorianCalendar c )  
    {  
     if  (  ( c.getActualMaximum ( GregorianCalendar.MONTH )  
        <  c.get ( GregorianCalendar.MONTH )  )  
       ||  ( c.getActualMaximum ( GregorianCalendar.DAY_OF_MONTH )  
          <  c.get ( GregorianCalendar.DAY_OF_MONTH )  )  
       ||  ( c.getActualMaximum ( GregorianCalendar.YEAR )  
          <  c.get ( GregorianCalendar.YEAR )  )  )  
      {  
       return false; 
      }  
     return true; 
    } 
public int getActualMinimum(int field)
See Also:
getActualMaximum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int)
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public static Locale[] getAvailableLocales()
See Also:
Locale.US
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public int getFirstDayOfWeek()
See Also:
getMinimalDaysInFirstWeek(), setFirstDayOfWeek(int)
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[436]Get First Day Of Week
By kabelbacha { at } airfrance { dot } fr on 2005/02/23 21:29:35  Rate
GregorianCalendar now = new GregorianCalendar ( an,mois,1 ) ; 
     int days= now.getActualMaximum ( Calendar.DAY_OF_MONTH ) ; 
     int jj=now.getFirstDayOfWeek (  ) ;
public abstract int getGreatestMinimum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getMaximum(int), getMinimum(int)
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public static Calendar getInstance()
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[1704]Doesn't return time; it returns GMT offset
By sean { dot } kenney { at } qwest { dot } com on 2006/01/25 11:41:34  Rate
The getInstance method does not return a time; it returns the time  
 offset from GMT. I'm in the Pacific time zone, so my call to this  
 method returns 2006-01-25-08:00 since I am 8:00 hours behind GMT.
public static Calendar getInstance(Locale aLocale)
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public static Calendar getInstance(TimeZone zone)
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[301]Set calendar to specific date
By Anonymous on 2003/07/08 17:37:44  Rate
Calendar admitCal = Calendar.getInstance (  ) ; 
 admitCal.set ( 2002, 2, 2 ) ;
public static Calendar getInstance(TimeZone zone,
                                   Locale aLocale)
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public abstract int getLeastMaximum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getGreatestMinimum(int), getMaximum(int), getMinimum(int)
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public abstract int getMaximum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMinimum(int), get
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public int getMinimalDaysInFirstWeek()
See Also:
setMinimalDaysInFirstWeek(int)
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public abstract int getMinimum(int field)
See Also:
getActualMaximum(int), getActualMinimum(int), getLeastMaximum(int), getGreatestMinimum(int), getMaximum(int), get
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public final Date getTime()
See Also:
getTimeInMillis(), setTime(Date)
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[399]Get time of specific time zone
By Anonymous on 2004/11/15 09:04:49  Rate
public Date getTime (  )   {  
     TimeZone zone = TimeZone.getTimeZone ( "GMT+0" ) ; 
     Calendar calendar = Calendar.getInstance ( zone ) ; 
     return calendar.getTime (  ) ; 
  }  
 
public long getTimeInMillis()
See Also:
setTimeInMillis(long), getTime()
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public TimeZone getTimeZone()
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public int hashCode()
See Also:
Hashtable, Object.equals(java.lang.Object)
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public static final int HOUR
See Also:
AM_PM
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public static final int HOUR_OF_DAY
See Also:
HOUR
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[1379]Get current hour of the day
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:32:11  Rate
Calendar expires = new GregorianCalendar (  ) ; 
 System.out.println ( " The current hour of the day is " + expires.HOUR_OF_DAY ) ;
protected final int internalGet(int field)
See Also:
get(int)
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public boolean isLenient()
See Also:
setLenient(boolean)
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protected boolean[] isSet
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public final boolean isSet(int field)
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protected boolean isTimeSet
See Also:
time
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public static final int JANUARY
See Also:
MONTH
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public static final int JULY
See Also:
MONTH
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public static final int JUNE
See Also:
MONTH
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public static final int MARCH
See Also:
MONTH
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public static final int MAY
See Also:
MONTH
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public static final int MILLISECOND
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public static final int MINUTE
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public static final int MONDAY
See Also:
DAY_OF_WEEK
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[1374]In current Year, check out this week MONDAY
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:17:36  Rate
System.out.println ( "In current Year, this week's MONDAY is the " + Calendar.MONDAY + "th" ) ;
public static final int MONTH
See Also:
UNDECIMBER, DECEMBER, NOVEMBER, OCTOBER, SEPTEMBER, AUGUST, JULY, JUNE, MAY, APRIL, MARCH, FEBRUARY, JANUARY
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public static final int NOVEMBER
See Also:
MONTH
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public static final int OCTOBER
See Also:
MONTH
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public static final int PM
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public abstract void roll(int field,
                          boolean up)
See Also:
set(int,int), add(int,int)
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public void roll(int field,
                 int amount)
See Also:
set(int,int), add(int,int), roll(int,boolean)
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public static final int SATURDAY
See Also:
DAY_OF_WEEK
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[1372]SATURDAY
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:16:00  Rate
Calendar expires = new GregorianCalendar (  ) ; 
 System.out.println ( "In current Year, this week's SATURDAY is the " + Calendar.SATURDAY + "th" ) ;
public static final int SECOND
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public static final int SEPTEMBER
See Also:
MONTH
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public void set(int field,
                int value)
See Also:
get(int), set(int,int,int,int,int,int), set(int,int,int,int,int), set(int,int,int), ArrayIndexOutOfBoundsException
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public final void set(int year,
                      int month,
                      int date)
See Also:
set(int,int,int,int,int,int), set(int,int,int,int,int), set(int,int), clear()
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public final void set(int year,
                      int month,
                      int date,
                      int hourOfDay,
                      int minute)
See Also:
set(int,int,int,int,int,int), set(int,int,int), set(int,int), clear()
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public final void set(int year,
                      int month,
                      int date,
                      int hourOfDay,
                      int minute,
                      int second)
See Also:
set(int,int,int,int,int), set(int,int,int), set(int,int), clear()
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public void setFirstDayOfWeek(int value)
See Also:
getMinimalDaysInFirstWeek(), getFirstDayOfWeek()
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public void setLenient(boolean lenient)
See Also:
isLenient()
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public void setMinimalDaysInFirstWeek(int value)
See Also:
getMinimalDaysInFirstWeek()
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public final void setTime(Date date)
See Also:
setTimeInMillis(long), getTime()
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[84]Set the time of a calendar
By Anonymous on 2003/08/15 16:32:04  Rate
GregorianCalendar calendar = new GregorianCalendar (  ) ; 
 calendar.setTime (  date  ) ; 
 

[850]Format a date to MM/dd/yyyy
By david wang (lwang10 { at } yahoo { dot } com) on 2004/10/08 13:00:41  Rate
String notifyDates = "8/3/2004"; 
 Calendar calendar = Calendar.getInstance (  ) ; 
 DateFormat dateFormat = new SimpleDateFormat ( "MM/dd/yyyy" ) ; 
      
 try {  
   Date date = dateFormat.parse ( notifyDates ) ;     
   calendar.setTime ( date ) ; 
   System.out.println ( "The initial date is : " + dateFormat.format ( calendar.getTime (  )  )  ) ; 
   calendar.add ( Calendar.DATE, 30 ) ; 
   System.out.println ( "The date in 30 days is : " + dateFormat.format ( calendar.getTime (  )  )  ) ; 
  } catch ( Exception e )  {  
   e.printStackTrace (  ) ; 
  } 

[1095]Roll a Calendar day
By Anonymous on 2004/11/04 12:39:02  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 setTimeInMillis(long millis)
See Also:
getTimeInMillis(), setTime(Date)
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[404]_
By Anonymous on 2003/09/19 10:17:45  Rate
GregorianCalendar calendar = new GregorianCalendar (  ) ; 
 calendar.setTimeInMillis ( 1063980997023 ) ;

[1318]Load current time
By Bruce Ingalls on 2005/02/24 18:30:09  Rate
//load current time 
 currentDate.setTimeInMillis ( System.currentTimeMillis (  )  ) ; 
 
public void setTimeZone(TimeZone value)
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public static final int SUNDAY
See Also:
DAY_OF_WEEK
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[1373]_
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:17:03  Rate
System.out.println ( "In current Year, this week's SUNDAY is the " + Calendar.SUNDAY+ "th" ) ;
public static final int THURSDAY
See Also:
DAY_OF_WEEK
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[1377]_
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:19:08  Rate
System.out.println ( "In current Year, this week's THURSDAY is the " + Calendar.THURSDAY + "th" ) ;
protected long time
See Also:
isTimeSet
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public String toString()
See Also:
Object
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public static final int TUESDAY
See Also:
DAY_OF_WEEK
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[1375]_
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:18:21  Rate
System.out.println ( "In current Year, this week's TUESDAY is the " + Calendar.TUESDAY + "th" ) ;
public static final int UNDECIMBER
See Also:
MONTH
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public static final int WEDNESDAY
See Also:
DAY_OF_WEEK
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[1376]_
By sapna_308 { at } yahoo { dot } com on 2005/04/05 11:18:44  Rate
System.out.println ( "In current Year, this week's WEDNESDAY is the " + Calendar.WEDNESDAY + "th" ) ;
public static final int WEEK_OF_MONTH
See Also:
getMinimalDaysInFirstWeek(), getFirstDayOfWeek()
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[773]Week of month
By Karthikeyan M on 2004/05/10 23:48:32  Rate
Calendar cal = GregorianCalendar.getInstance (  ) ;  
 int week = cal.get ( Calendar.WEEK_OF_MONTH ) ; 
 System.out.println ( "Week="+week+" Date="+cal.getTime (  )  ) ; 
  
  
 Calendar calendar = new GregorianCalendar (  ) ;     
 calendar.set (  Calendar.WEEK_OF_MONTH, 4  ) ; // pass a valid week 
 System.out.println ( "Date =" + calendar.getTime (  )   ) ;
public static final int WEEK_OF_YEAR
See Also:
getMinimalDaysInFirstWeek(), getFirstDayOfWeek()
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[887]Week of year
By Arpit Rai on 2004/09/07 17:38:33  Rate
Calendar cal = Calendar.getInstance (  ) ;   
 int week = cal.get ( Calendar.WEEK_OF_YEAR ) ;  
 System.out.println ( "Week="+week ) ; 
public static final int YEAR
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[377]Calendar year
By Anonymous on 2004/11/10 15:17:10  Rate
Calendar cal = GregorianCalendar.getInstance (  ) ; 
 int year = cal.get ( Calendar.YEAR ) ; // 2003

[709]_
By Virgilio So (Jan So) on 2004/04/02 09:13:26  Rate
Calendar calendar = new GregorianCalendar (  ) ;    
 calendar.setTime (  date  ) ; // pass a valid date here 
 System.out.println ( "Year is " + calendar.YEAR ) ;
public static final int ZONE_OFFSET
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[128]Get the zone offset in hours
By Anonymous on 2003/08/29 13:01:25  Rate
// Get the zone offset in hours 
 int zone_offset = now.get ( Calendar.ZONE_OFFSET )  /  ( 60 * 60 * 1000 ) ;
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