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/** Declaration of extension methods for base additions

   Copyright (C) 2003-2010 Free Software Foundation, Inc.

   Written by:  Richard Frith-Macdonald <rfm@gnu.org>
   and:         Adam Fedor <fedor@gnu.org>

   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.

*/

#ifndef	INCLUDED_NSCalendarDate_GNUstepBase_h
#define	INCLUDED_NSCalendarDate_GNUstepBase_h

#import <GNUstepBase/GSVersionMacros.h>
#import <Foundation/NSCalendarDate.h>

#if	defined(__cplusplus)
extern "C" {
#endif

#if	OS_API_VERSION(GS_API_NONE,GS_API_LATEST)

@interface NSCalendarDate (GNUstepBase)

/** According to the ISO definition of a week, each year begins with the
  * Monday of the week containing the 4th of January. If we a have a date
  * early in January or late in December we therefore may need to adjust
  * the year to match the definition of a week.<br />
  * This method is used to return the ISO year rather than the normal
  * calendar year.
  */
- (NSUInteger) isoYear;

/**
 * The ISO standard week of the year is based on the first week of the
 * year being that week (starting on monday) for which the thursday
 * is on or after the first of january.<br />
 * This has the effect that, if january first is a friday, saturday or
 * sunday, the days of that week (up to and including the sunday) are
 * considered to be in week 53 of the preceding year. Similarly if the
 * last day of the year is a monday tuesday or wednesday, these days are
 * part of week 1 of the next year.
 */
- (NSInteger) weekOfYear;

@end

#endif	/* OS_API_VERSION */

#if	defined(__cplusplus)
}
#endif

#endif	/* INCLUDED_NSCalendarDate_GNUstepBase_h */