86 lines
1.6 KiB
C
86 lines
1.6 KiB
C
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/*
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* Copyright 2010, Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _HOLIDAY_H_
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#define _HOLIDAY_H_
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#include <DateTime.h>
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namespace BPrivate {
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class BHoliday {
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public:
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virtual ~BHoliday() { };
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};
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class BEasterHoliday : public BHoliday {
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public:
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static BDate EasterSunday(int32 year);
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static BDate AscensionDay(int32 year);
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static BDate PentecostDay(int32 year);
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};
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/*!
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Returns the date for easter sunday for the \c year.
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*/
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/*static*/ BDate
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BEasterHoliday::EasterSunday(int32 year)
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{
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// http://bloggingabout.net/blogs/jschreuder/archive/2005/06/24/7019.aspx
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int32 gold = year % 19;
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int32 century = year / 100;
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int32 h = (century - (int32)(century / 4)
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- (int32)((century * 8 + 13) / 25) + 19 * gold + 15) % 30;
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int32 i = h - (int32)(h / 28) * (1 - (int32)(h / 28)
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* (int32)(29 / (h + 1)) * (int32)((21 - gold) / 11));
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int32 day = i - ((year + (int32)(year / 4) + i + 2 - century
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+ (int32)(century / 4)) % 7) + 28;
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BDate date;
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if (day > 31)
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date.SetDate(year, 4, day - 31);
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else
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date.SetDate(year, 3, day);
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return date;
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}
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/*!
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Returns the date for ascension day for the \c year.
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*/
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/*static*/ BDate
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BEasterHoliday::AscensionDay(int32 year)
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{
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BDate date = EasterSunday(year);
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date.AddDays(39);
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return date;
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}
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/*!
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Returns the date for pentecost day for the \c year.
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*/
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/*static*/ BDate
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BEasterHoliday::PentecostDay(int32 year)
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{
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BDate date = EasterSunday(year);
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date.AddDays(49);
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return date;
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}
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} // namespace BPrivate
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using BPrivate::BHoliday;
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using BPrivate::BEasterHoliday;
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#endif // _HOLIDAY_H_
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