japancal.h | Explore in Territory

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 ********************************************************************************
 * Copyright (C) 2003-2008, International Business Machines Corporation
 * and others. All Rights Reserved.
 ********************************************************************************
 *
 * File JAPANCAL.H
 *
 * Modification History:
 *
 *   Date        Name        Description
 *   05/13/2003  srl         copied from gregocal.h
 ********************************************************************************
 */

#ifndef JAPANCAL_H
#define JAPANCAL_H

#include "unicode/utypes.h"

#if !UCONFIG_NO_FORMATTING

#include "unicode/calendar.h"
#include "unicode/gregocal.h"

U_NAMESPACE_BEGIN

/**
 * Concrete class which provides the Japanese calendar.
 * <P>
 * <code>JapaneseCalendar</code> is a subclass of <code>GregorianCalendar</code>
 * that numbers years and eras based on the reigns of the Japanese emperors.
 * The Japanese calendar is identical to the Gregorian calendar in all respects
 * except for the year and era.  The ascension of each  emperor to the throne
 * begins a new era, and the years of that era are numbered starting with the
 * year of ascension as year 1.
 * <p>
 * Note that in the year of an imperial ascension, there are two possible sets
 * of year and era values: that for the old era and for the new.  For example, a
 * new era began on January 7, 1989 AD.  Strictly speaking, the first six days
 * of that year were in the Showa era, e.g. "January 6, 64 Showa", while the rest
 * of the year was in the Heisei era, e.g. "January 7, 1 Heisei".  This class
 * handles this distinction correctly when computing dates.  However, in lenient
 * mode either form of date is acceptable as input. 
 * <p>
 * In modern times, eras have started on January 8, 1868 AD, Gregorian (Meiji),
 * July 30, 1912 (Taisho), December 25, 1926 (Showa), and January 7, 1989 (Heisei).  Constants
 * for these eras, suitable for use in the <code>UCAL_ERA</code> field, are provided
 * in this class.  Note that the <em>number</em> used for each era is more or
 * less arbitrary.  Currently, the era starting in 645 AD is era #0; however this
 * may change in the future.  Use the predefined constants rather than using actual,
 * absolute numbers.
 * <p>
 * Since ICU4C 63, start date of each era is imported from CLDR. CLDR era data
 * may contain tentative era in near future with placeholder names. By default,
 * such era data is not enabled. ICU4C users who want to test the behavior of
 * the future era can enable this one of following settings (in the priority
 * order):
 * <ol>
 * <li>Environment variable <code>ICU_ENABLE_TENTATIVE_ERA=true</code>.</li>
 * </nl>
 * @internal
 */
class JapaneseCalendar : public GregorianCalendar { … };

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_FORMATTING */

#endif
//eof
chromium/third_party/icu/source/i18n/japancal.h
