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Persian Calendar is an implementation of the Iranian (Jalali) calendar based on the ICU4J calendar framework.
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/*
PersianCalendarUtils.java
2005-02-20 05:56:36
Copyright C Ghasem Kiani
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.ghasemkiani.util;
/**
This class contains some utility functions and constants used by other
Persian Calendar classes.
@author Ghasem Kiani
@version 2.1
*/
public class PersianCalendarUtils
{
/**
Julian day corresponding to 1 Farvardin 1 A.H., corresponding to
March 19, 622 A.D. by the Julian version of the Gregorian calendar.
*/
public static final long EPOCH = 1948321;
/**
A modulo function suitable for our purpose.
@param a the dividend.
@param b the divisor.
@return the remainder of integer division.
*/
public static long mod(double a, double b)
{
return (long)(a - b * Math.floor(a / b));
}
/**
An integer division function suitable for our purpose.
@param a the dividend.
@param b the divisor.
@return the quotient of integer division.
*/
public static long div(double a, double b)
{
return (long)Math.floor(a / b);
}
/**
Extracts the year from a packed long value.
@param r the packed long value.
@return the year part of date.
*/
public static long y(long r)
{
return r >> 16;
}
/**
Extracts the month from a packed long value.
@param r the packed long value
.
@return the month part of date.
*/
public static int m(long r)
{
return (int)(r & 0xff00) >> 8;
}
/**
Extracts the day from a packed long value.
@param r the packed long value.
@return the day part of date.
*/
public static int d(long r)
{
return (int)(r & 0xff);
}
}
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