author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 21 Jun 2010 15:38:59 +0300 | |
branch | RCL_3 |
changeset 25 | bf573002ff72 |
parent 10 | 38571fd2a704 |
permissions | -rw-r--r-- |
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// Copyright (c) 2000-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Implementation of the TGregorianCalendar class. |
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// |
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#include <e32std.h> |
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#include <e32math.h> |
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#include "gregoriancalendar.h" |
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// Constants |
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const TReal KFourYears = 4.0; |
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const TReal KFourHundredYears = 400; |
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const TReal KOneHundredYears = 100; |
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const TReal KGregStartEpoch = 1721424.5; |
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// |
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const TInt KDayOffsetByZero = 0; |
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const TInt KGregDaysInNormYear = 365; |
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const TInt KDaysIn400Years = 146097; |
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const TInt KDaysIn100Years = 36524; |
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const TInt KDaysIn4Years = 1461; |
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const TInt KGregCycle = 12; |
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const TInt KGregLeaps = 7; |
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const TInt KGregOffset = 11; |
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const TInt KGregStdMonth = 30; |
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const TInt KLastDayInDecember = 31; |
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|
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////////////////////////////////////////////////////////////////////// |
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// Construction/Destruction |
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////////////////////////////////////////////////////////////////////// |
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//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: TGregorianCalendar |
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// Arguments: None |
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// |
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// Comments: Constructor |
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// |
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// Return: None |
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//------------------------------------------------------ |
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TGregorianCalendar::TGregorianCalendar() |
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{ |
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InitMembers(); |
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} |
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//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: TGregorianCalendar |
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// Arguments: TReal |
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// |
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// Comments: Overloaded Constructor |
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// |
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// Return: None |
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//------------------------------------------------------ |
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TGregorianCalendar::TGregorianCalendar(TReal aJD) __SOFTFP |
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{ |
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iJulianDay = aJD; |
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InitMembers(); |
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} |
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|
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//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: InitMembers |
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// Arguments: None |
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// |
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// Comments: This function initialises the member variables |
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// or the class. It is called in the constructors |
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// |
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// Return: |
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//------------------------------------------------------ |
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void TGregorianCalendar::InitMembers() |
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{ |
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iStartEpoch = KGregStartEpoch + KCalConvPointFive; |
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Floor(iDaysInNormYear,KGregDaysInNormYear); |
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iCycle = KGregCycle; |
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iLeaps = KGregLeaps; |
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iOffset = KGregOffset; |
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iStdYearMonth = KGregStdMonth; |
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} |
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|
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//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: IsLeapYear |
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// Arguments: const TInt |
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// |
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// Comments: Determines whether the given year is a leap year. |
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// |
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// Return: ETrue if leap year, else EFalse |
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//------------------------------------------------------ |
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TBool TGregorianCalendar::IsLeapYear(const TInt aYear)const |
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{ |
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TReal result; |
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TBool rtn = EFalse; |
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|
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Mod(result,aYear,KFourYears); |
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108 |
|
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109 |
if (!result) |
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110 |
{ |
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rtn = ETrue; |
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} |
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113 |
|
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Mod(result,aYear,KOneHundredYears); |
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115 |
|
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if (!result) |
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{ |
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Mod(result,aYear,KFourHundredYears); |
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119 |
|
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if (result) |
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121 |
{ |
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rtn = EFalse; |
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} |
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} |
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return rtn; |
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} |
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127 |
|
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128 |
//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: GregToJulianDay |
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// Arguments: const TArithmeticalDate& |
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// |
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// Comments: converts gregorian date to Julian day value |
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// |
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// Return: Julian day value for the given Gregorian date |
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//------------------------------------------------------ |
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TReal TGregorianCalendar::GregToJulianDay(const TArithmeticalDate& aDate) const __SOFTFP |
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{ |
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TReal result; |
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TReal tempReal; |
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TInt tempInt; |
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142 |
|
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// days to the start of the year based on normal years |
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result = iStartEpoch + (iDaysInNormYear * (aDate.iYear - 1)); |
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145 |
|
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146 |
// leap year corrections |
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tempReal = (aDate.iYear - 1) / KFourYears; |
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Floor(tempInt,tempReal); |
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result += tempInt; |
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150 |
|
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tempReal = (aDate.iYear - 1) / KOneHundredYears; |
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Floor(tempInt,tempReal); |
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result -= tempInt; |
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154 |
|
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tempReal = (aDate.iYear - 1) / KFourHundredYears; |
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Floor(tempInt,tempReal); |
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result += tempInt; |
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158 |
|
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// days in whole months in the year in question - approx |
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// based on Feb having 30 days |
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tempInt = DaysMonthsElapsed(aDate.iMonth); |
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result += tempInt; |
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163 |
|
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// correction for assumption that Feb has 30 days |
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if (aDate.iMonth <= (EFebruary + 1)) |
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result += KDayOffsetByZero; |
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else if (aDate.iMonth > (EFebruary + 1) && IsLeapYear(aDate.iYear)) |
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result -= 1; |
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169 |
else |
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result -= 2; |
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|
171 |
|
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172 |
// days in month in question |
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result += aDate.iDay; |
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|
174 |
|
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175 |
return result; |
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176 |
} |
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|
177 |
|
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178 |
//------------------------------------------------------ |
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179 |
// Class: TGregorianCalendar |
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// Function: GregorianToDateTime |
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// Arguments: TDateTime& |
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182 |
// |
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183 |
// Comments: This gets the date from the TGregorianCalendar class |
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// and places in the the given TDateTime class |
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185 |
// |
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186 |
// Return: void |
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187 |
//------------------------------------------------------ |
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188 |
void TGregorianCalendar::GregorianToDateTime(TDateTime& aDT) |
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189 |
{ |
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190 |
TArithmeticalDate gregDate; |
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191 |
GregFromJulianDay(gregDate,iJulianDay); |
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|
192 |
|
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193 |
aDT.Set(0,EJanuary,0,0,0,0,0); |
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aDT.SetMonth((TMonth)(gregDate.iMonth - 1)); |
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aDT.SetDay(gregDate.iDay - 1); |
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196 |
aDT.SetYear(gregDate.iYear); |
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197 |
} |
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|
198 |
|
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|
199 |
//------------------------------------------------------ |
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200 |
// Class: TGregorianCalendar |
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201 |
// Function: CalcGregYear |
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202 |
// Arguments: TArithmeticalDate& |
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203 |
// |
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204 |
// Comments: Calculates the gregorian year from Julian |
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205 |
// day value. |
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206 |
// |
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207 |
// Return: None |
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208 |
//------------------------------------------------------ |
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209 |
void TGregorianCalendar::CalcGregYear(TArithmeticalDate& aDate, TReal aJulianDay) const __SOFTFP |
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210 |
{ |
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211 |
TReal d0; |
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TReal d1; |
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213 |
TReal d2; |
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214 |
TReal d3; |
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215 |
TReal year; |
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TInt n400; |
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TInt n100; |
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TInt n4; |
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TInt n1; |
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TInt32 yearInt32; |
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221 |
|
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// determine year |
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// get to start of calendar ie year 1 |
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d0 = aJulianDay - iStartEpoch - 1; |
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225 |
|
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Mod(d1,d0,KDaysIn400Years); |
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227 |
|
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Mod(d2,d1,KDaysIn100Years); |
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229 |
|
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Mod(d3,d2,KDaysIn4Years); |
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231 |
|
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// number of 400 year blocks |
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d0 /= KDaysIn400Years; |
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Floor(n400,d0); |
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235 |
|
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// number of 100 year blocks |
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d1 /= KDaysIn100Years; |
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Floor(n100,d1); |
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239 |
|
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// number of 4 year blocks |
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d2 /= KDaysIn4Years; |
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Floor(n4,d2); |
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243 |
|
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// number of 1 year blocks |
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d3 /= KGregDaysInNormYear; |
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Floor(n1,d3); |
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247 |
|
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// calc year |
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year = (KFourHundredYears * n400) + (KOneHundredYears * n100) + (KFourYears * n4) + n1; |
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Math::Int(yearInt32,year); |
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251 |
|
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if ((n100 == (KFourHundredYears / KOneHundredYears)) || (n1 == KFourYears)) |
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253 |
{ |
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aDate.iYear = yearInt32; |
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} |
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256 |
else |
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257 |
{ |
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aDate.iYear = yearInt32 + 1; |
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} |
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} |
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261 |
|
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//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: GregDateDiff |
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// Arguments: const TArithmeticalDate, const TArithmeticalDate |
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// |
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// Comments: This function Determines the difference in days |
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// between two gregorian dates. |
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// |
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// Return: Days difference |
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//------------------------------------------------------ |
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TInt TGregorianCalendar::GregDateDiff(const TArithmeticalDate aDate1, const TArithmeticalDate aDate2)const |
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{ |
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TInt diff; |
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TReal diffReal; |
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diffReal = GregToJulianDay(aDate2) - GregToJulianDay(aDate1); |
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Floor(diff,diffReal); |
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return diff; |
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} |
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280 |
|
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281 |
//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: DayNumber |
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// Arguments: const TArithmeticalDate& |
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// |
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// Comments: this function returns the number of days that |
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// have elapsed in the given year |
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// |
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// Return: see comment |
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290 |
//------------------------------------------------------ |
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TInt TGregorianCalendar::DayNumber(const TArithmeticalDate& aDate)const |
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{ |
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TArithmeticalDate tempDate; |
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TInt dayNum; |
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295 |
|
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tempDate.iDay = KLastDayInDecember; |
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tempDate.iMonth = EDecember + 1; |
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tempDate.iYear = aDate.iYear - 1; |
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|
299 |
|
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dayNum = GregDateDiff(tempDate,aDate); |
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|
301 |
|
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return dayNum; |
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} |
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|
304 |
|
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305 |
//------------------------------------------------------ |
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// Class: TGregorianCalendar |
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// Function: GregFromJulianDay |
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// Arguments: TArithmeticalDate& , TReal |
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309 |
// |
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// Comments: This function converts a gregorian date to |
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// a julian day |
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312 |
// |
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// Return: void |
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314 |
//------------------------------------------------------ |
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315 |
void TGregorianCalendar::GregFromJulianDay(TArithmeticalDate& aDate, TReal aJulianDay) const __SOFTFP |
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316 |
{ |
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TReal priorDays; |
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TReal correction; |
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TReal day; |
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TReal month; |
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|
321 |
TInt32 dayInt32; |
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|
322 |
TInt32 monthInt32; |
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|
323 |
|
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324 |
CalcGregYear(aDate,aJulianDay); |
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|
325 |
|
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326 |
aDate.iDay = 1; |
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327 |
aDate.iMonth = EJanuary + 1; |
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|
328 |
|
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329 |
priorDays = aJulianDay - GregToJulianDay(aDate); |
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330 |
|
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331 |
aDate.iMonth = EMarch + 1; |
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332 |
|
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333 |
if (aJulianDay < GregToJulianDay(aDate)) |
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334 |
{ |
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335 |
correction = KDayOffsetByZero; |
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336 |
} |
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337 |
else if ((aJulianDay >= GregToJulianDay(aDate)) && IsLeapYear(aDate.iYear)) |
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338 |
{ |
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339 |
correction = 1; |
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340 |
} |
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341 |
else |
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342 |
{ |
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343 |
correction = 2; |
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344 |
} |
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345 |
|
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346 |
month = priorDays + correction; |
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Revision: 201007
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347 |
Math::Int(monthInt32,month); |
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Revision: 201007
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monthInt32 = DayMonthInYear(monthInt32); |
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aDate.iMonth = monthInt32; |
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350 |
|
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day = aJulianDay - GregToJulianDay(aDate) + 1; |
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Math::Int(dayInt32,day); |
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353 |
aDate.iDay = dayInt32; |
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354 |
} |
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355 |
|
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356 |
|
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357 |
//------------------------------------------------------ |
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358 |
// Class: TArithmeticalCalendar |
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359 |
// Function: DaysMonthsElapsed |
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360 |
// Arguments: const TInt ,const TInt ,const TInt , const TInt ,const TInt |
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361 |
// |
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362 |
// Comments: The use of this function varies between calendars |
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363 |
// however since the form of the equation is the same it |
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Revision: 201007
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364 |
// is represented in this class. The equation is use to |
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Revision: 201007
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365 |
// calculate the number of days in whole months of a particular |
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366 |
// year up to a particular date in the Gregorian and |
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367 |
// Islamic calendars. The Hebrew calendar uses this |
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Revision: 201007
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368 |
// equation to calculate the number of whole months |
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369 |
// since the start of the calendar. |
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370 |
// |
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371 |
// |
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372 |
// Return: See comments |
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373 |
//------------------------------------------------------ |
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Revision: 201007
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374 |
TInt TGregorianCalendar::DaysMonthsElapsed(const TInt aYear) const |
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375 |
{ |
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Revision: 201007
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376 |
TReal tempReal; |
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377 |
TInt result; |
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378 |
|
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Revision: 201007
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379 |
tempReal = iOffset * iLeaps; |
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Revision: 201007
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380 |
Mod(tempReal,tempReal,iCycle); |
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381 |
tempReal = ((iLeaps * aYear) - iLeaps + tempReal) / iCycle; |
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382 |
Floor(result,tempReal); |
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Revision: 201007
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|
383 |
result = result + (iStdYearMonth * (aYear - KCalConvYearOffsetByOne)); |
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|
384 |
|
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|
385 |
return result; |
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|
386 |
} |
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|
387 |
|
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|
388 |
//------------------------------------------------------ |
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Revision: 201007
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|
389 |
// Class: TArithmeticalCalendar |
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Revision: 201007
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|
390 |
// Function: DayMonthInYear |
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Revision: 201007
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|
391 |
// Arguments: None |
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Revision: 201007
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|
392 |
// |
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Revision: 201007
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|
393 |
// Comments: This function Determines the month based on |
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Revision: 201007
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|
394 |
// the number of days into the year it is |
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Revision: 201007
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|
395 |
// |
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Revision: 201007
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|
396 |
// Return: TInt - Month |
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Revision: 201007
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|
397 |
//------------------------------------------------------ |
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Revision: 201007
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|
398 |
TInt TGregorianCalendar::DayMonthInYear(const TInt aDays) const |
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Revision: 201007
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|
399 |
{ |
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Revision: 201007
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|
400 |
TReal tempReal; |
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Revision: 201007
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|
401 |
TInt result; |
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Revision: 201007
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parents:
diff
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|
402 |
|
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Revision: 201007
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parents:
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|
403 |
tempReal = iLeaps * iOffset; |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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|
404 |
Mod(tempReal,tempReal,iCycle); |
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Revision: 201007
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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|
405 |
tempReal = (iCycle * aDays) + (iCycle * iStdYearMonth) + iLeaps - KCalConvYearOffsetByOne + iCycle - tempReal; |
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Revision: 201007
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|
406 |
tempReal = tempReal / ((iCycle * iStdYearMonth) + iLeaps); |
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Revision: 201007
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|
407 |
Floor(result,tempReal); |
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Revision: 201007
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parents:
diff
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|
408 |
|
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Revision: 201007
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|
409 |
return result; |
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Revision: 201007
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parents:
diff
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|
410 |
} |