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07d85c44998f42545175ee77c192b901b52a30ca
libreoffice/tools/source/datetime/tdate.cxx
Noel Grandin c32a5a3b8e simplify Date/Time/DateTime conversion code 
add constructors to Date/DateTime/Time,
that take the css::util counterparts,
to simplify code converting between these type

Change-Id: I4b03da02c63f65b6ec18cb4d6ecc3859bdef1ff7
Reviewed-on: https://gerrit.libreoffice.org/13855
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>
2015-01-13 15:24:04 +00:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#if defined( WNT )
#include <windows.h>
#else
#include <time.h>
#endif
#include <tools/date.hxx>
#include <sal/log.hxx>
static const sal_uInt16 aDaysInMonth[12] = { 31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31 };
#define MAX_DAYS 3636532
inline bool ImpIsLeapYear( sal_uInt16 nYear )
{
return ( ( ((nYear % 4) == 0) && ((nYear % 100) != 0) ) ||
( (nYear % 400) == 0 ) );
}
// All callers must have sanitized or normalized month and year values!
inline sal_uInt16 ImplDaysInMonth( sal_uInt16 nMonth, sal_uInt16 nYear )
{
if ( nMonth != 2 )
return aDaysInMonth[nMonth-1];
else
{
if (ImpIsLeapYear(nYear))
return aDaysInMonth[nMonth-1] + 1;
else
return aDaysInMonth[nMonth-1];
}
}
// static
sal_uInt16 Date::GetDaysInMonth( sal_uInt16 nMonth, sal_uInt16 nYear )
{
SAL_WARN_IF( nMonth < 1 || 12 < nMonth, "tools", "Date::GetDaysInMonth - nMonth out of bounds " << nMonth);
if (nMonth < 1)
nMonth = 1;
else if (12 < nMonth)
nMonth = 12;
return ImplDaysInMonth( nMonth, nYear);
}
long Date::GetAsNormalizedDays() const
{
// This is a very common datum we often calculate from.
if (nDate == 18991230) // 1899-12-30
{
assert(DateToDays( GetDay(), GetMonth(), GetYear() ) == 693594);
return 693594;
}
return DateToDays( GetDay(), GetMonth(), GetYear() );
}
long Date::DateToDays( sal_uInt16 nDay, sal_uInt16 nMonth, sal_uInt16 nYear )
{
long nDays;
Normalize( nDay, nMonth, nYear);
nDays = ((sal_uIntPtr)nYear-1) * 365;
nDays += ((nYear-1) / 4) - ((nYear-1) / 100) + ((nYear-1) / 400);
for( sal_uInt16 i = 1; i < nMonth; i++ )
nDays += ImplDaysInMonth(i,nYear);
nDays += nDay;
return nDays;
}
static void DaysToDate( long nDays,
sal_uInt16& rDay, sal_uInt16& rMonth, sal_uInt16& rYear )
{
long nTempDays;
long i = 0;
bool bCalc;
do
{
nTempDays = (long)nDays;
rYear = (sal_uInt16)((nTempDays / 365) - i);
nTempDays -= ((sal_uIntPtr)rYear-1) * 365;
nTempDays -= ((rYear-1) / 4) - ((rYear-1) / 100) + ((rYear-1) / 400);
bCalc = false;
if ( nTempDays < 1 )
{
i++;
bCalc = true;
}
else
{
if ( nTempDays > 365 )
{
if ( (nTempDays != 366) || !ImpIsLeapYear( rYear ) )
{
i--;
bCalc = true;
}
}
}
}
while ( bCalc );
rMonth = 1;
while ( (sal_uIntPtr)nTempDays > ImplDaysInMonth( rMonth, rYear ) )
{
nTempDays -= ImplDaysInMonth( rMonth, rYear );
rMonth++;
}
rDay = (sal_uInt16)nTempDays;
}
Date::Date( DateInitSystem )
{
#if defined WNT
SYSTEMTIME aDateTime;
GetLocalTime( &aDateTime );
// Combine to date
nDate = ((sal_uIntPtr)aDateTime.wDay) +
(((sal_uIntPtr)aDateTime.wMonth)*100) +
(((sal_uIntPtr)aDateTime.wYear)*10000);
#else
time_t nTmpTime;
struct tm aTime;
// get current time
nTmpTime = time( 0 );
// compute date
if ( localtime_r( &nTmpTime, &aTime ) )
{
nDate = ((sal_uIntPtr)aTime.tm_mday) +
(((sal_uIntPtr)(aTime.tm_mon+1))*100) +
(((sal_uIntPtr)(aTime.tm_year+1900))*10000);
}
else
nDate = 1 + 100 + (((sal_uIntPtr)1900)*10000);
#endif
}
Date::Date( const ::com::sun::star::util::DateTime& rDateTime )
{
init( rDateTime.Day, rDateTime.Month, rDateTime.Year );
}
void Date::SetDay( sal_uInt16 nNewDay )
{
sal_uIntPtr nMonth = GetMonth();
sal_uIntPtr nYear = GetYear();
nDate = ((sal_uIntPtr)(nNewDay%100)) + (nMonth*100) + (nYear*10000);
}
void Date::SetMonth( sal_uInt16 nNewMonth )
{
sal_uIntPtr nDay = GetDay();
sal_uIntPtr nYear = GetYear();
nDate = nDay + (((sal_uIntPtr)(nNewMonth%100))*100) + (nYear*10000);
}
void Date::SetYear( sal_uInt16 nNewYear )
{
sal_uIntPtr nDay = GetDay();
sal_uIntPtr nMonth = GetMonth();
nDate = nDay + (nMonth*100) + (((sal_uIntPtr)(nNewYear%10000))*10000);
}
DayOfWeek Date::GetDayOfWeek() const
{
return (DayOfWeek)((sal_uIntPtr)(GetAsNormalizedDays()-1) % 7);
}
sal_uInt16 Date::GetDayOfYear() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_uInt16 nYear = GetYear();
Normalize( nDay, nMonth, nYear);
for( sal_uInt16 i = 1; i < nMonth; i++ )
nDay = nDay + ::ImplDaysInMonth( i, nYear ); // += yields a warning on MSVC, so don't use it
return nDay;
}
sal_uInt16 Date::GetWeekOfYear( DayOfWeek eStartDay,
sal_Int16 nMinimumNumberOfDaysInWeek ) const
{
short nWeek;
short n1WDay = (short)Date( 1, 1, GetYear() ).GetDayOfWeek();
short nDayOfYear = (short)GetDayOfYear();
// weekdays start at 0, thus decrement one
nDayOfYear--;
// account for StartDay
n1WDay = (n1WDay+(7-(short)eStartDay)) % 7;
if (nMinimumNumberOfDaysInWeek < 1 || 7 < nMinimumNumberOfDaysInWeek)
{
SAL_WARN( "tools.datetime", "Date::GetWeekOfYear: invalid nMinimumNumberOfDaysInWeek" );
nMinimumNumberOfDaysInWeek = 4;
}
if ( nMinimumNumberOfDaysInWeek == 1 )
{
nWeek = ((n1WDay+nDayOfYear)/7) + 1;
// Set to 53rd week only if we're not in the
// first week of the new year
if ( nWeek == 54 )
nWeek = 1;
else if ( nWeek == 53 )
{
short nDaysInYear = (short)GetDaysInYear();
short nDaysNextYear = (short)Date( 1, 1, GetYear()+1 ).GetDayOfWeek();
nDaysNextYear = (nDaysNextYear+(7-(short)eStartDay)) % 7;
if ( nDayOfYear > (nDaysInYear-nDaysNextYear-1) )
nWeek = 1;
}
}
else if ( nMinimumNumberOfDaysInWeek == 7 )
{
nWeek = ((n1WDay+nDayOfYear)/7);
// First week of a year is equal to the last week of the previous year
if ( nWeek == 0 )
{
Date aLastDatePrevYear( 31, 12, GetYear()-1 );
nWeek = aLastDatePrevYear.GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
}
}
else // ( nMinimumNumberOfDaysInWeek == somehing_else, commentary examples for 4 )
{
// x_monday - thursday
if ( n1WDay < nMinimumNumberOfDaysInWeek )
nWeek = 1;
// Friday
else if ( n1WDay == nMinimumNumberOfDaysInWeek )
nWeek = 53;
// Saturday
else if ( n1WDay == nMinimumNumberOfDaysInWeek + 1 )
{
// Year after leapyear
if ( Date( 1, 1, GetYear()-1 ).IsLeapYear() )
nWeek = 53;
else
nWeek = 52;
}
// Sunday
else
nWeek = 52;
if ( (nWeek == 1) || (nDayOfYear + n1WDay > 6) )
{
if ( nWeek == 1 )
nWeek += (nDayOfYear + n1WDay) / 7;
else
nWeek = (nDayOfYear + n1WDay) / 7;
if ( nWeek == 53 )
{
// next x_Sunday == first x_Sunday in the new year
// == still the same week!
long nTempDays = GetAsNormalizedDays();
nTempDays += 6 - (GetDayOfWeek()+(7-(short)eStartDay)) % 7;
sal_uInt16 nDay;
sal_uInt16 nMonth;
sal_uInt16 nYear;
DaysToDate( nTempDays, nDay, nMonth, nYear );
nWeek = Date( nDay, nMonth, nYear ).GetWeekOfYear( eStartDay, nMinimumNumberOfDaysInWeek );
}
}
}
return (sal_uInt16)nWeek;
}
sal_uInt16 Date::GetDaysInMonth() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_uInt16 nYear = GetYear();
Normalize( nDay, nMonth, nYear);
return ImplDaysInMonth( nMonth, nYear );
}
bool Date::IsLeapYear() const
{
sal_uInt16 nYear = GetYear();
return ImpIsLeapYear( nYear );
}
bool Date::IsValidAndGregorian() const
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_uInt16 nYear = GetYear();
if ( !nMonth || (nMonth > 12) )
return false;
if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
return false;
else if ( nYear <= 1582 )
{
if ( nYear < 1582 )
return false;
else if ( nMonth < 10 )
return false;
else if ( (nMonth == 10) && (nDay < 15) )
return false;
}
return true;
}
bool Date::IsValidDate() const
{
return IsValidDate( GetDay(), GetMonth(), GetYear());
}
//static
bool Date::IsValidDate( sal_uInt16 nDay, sal_uInt16 nMonth, sal_uInt16 nYear )
{
if ( !nMonth || (nMonth > 12) )
return false;
if ( !nDay || (nDay > ImplDaysInMonth( nMonth, nYear )) )
return false;
return true;
}
bool Date::Normalize()
{
sal_uInt16 nDay = GetDay();
sal_uInt16 nMonth = GetMonth();
sal_uInt16 nYear = GetYear();
if (!Normalize( nDay, nMonth, nYear))
return false;
SetDay( nDay);
SetMonth( nMonth);
SetYear( nYear);
return true;
}
//static
bool Date::Normalize( sal_uInt16 & rDay, sal_uInt16 & rMonth, sal_uInt16 & rYear )
{
if (IsValidDate( rDay, rMonth, rYear))
return false;
if (rMonth > 12)
{
rYear += rMonth / 12;
rMonth = rMonth % 12;
}
if (!rMonth)
{
if (!rYear)
{
rYear = 0;
rMonth = 1;
if (rDay > 31)
rDay -= 31;
else
rDay = 1;
}
else
{
--rYear;
rMonth = 12;
}
}
sal_uInt16 nDays;
while (rDay > (nDays = ImplDaysInMonth( rMonth, rYear)))
{
rDay -= nDays;
if (rMonth < 12)
++rMonth;
else
{
++rYear;
rMonth = 1;
}
}
if (rYear > 9999)
{
rDay = 31;
rMonth = 12;
rYear = 9999;
}
return true;
}
Date& Date::operator +=( long nDays )
{
sal_uInt16 nDay;
sal_uInt16 nMonth;
sal_uInt16 nYear;
if (nDays == 0)
return *this;
long nTempDays = GetAsNormalizedDays();
nTempDays += nDays;
if ( nTempDays > MAX_DAYS )
nDate = 31 + (12*100) + (((sal_uIntPtr)9999)*10000);
else if ( nTempDays <= 0 )
nDate = 1 + 100;
else
{
DaysToDate( nTempDays, nDay, nMonth, nYear );
nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
}
return *this;
}
Date& Date::operator -=( long nDays )
{
sal_uInt16 nDay;
sal_uInt16 nMonth;
sal_uInt16 nYear;
if (nDays == 0)
return *this;
long nTempDays = GetAsNormalizedDays();
nTempDays -= nDays;
if ( nTempDays > MAX_DAYS )
nDate = 31 + (12*100) + (((sal_uIntPtr)9999)*10000);
else if ( nTempDays <= 0 )
nDate = 1 + 100;
else
{
DaysToDate( nTempDays, nDay, nMonth, nYear );
nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
}
return *this;
}
Date& Date::operator ++()
{
sal_uInt16 nDay;
sal_uInt16 nMonth;
sal_uInt16 nYear;
long nTempDays = GetAsNormalizedDays();
if ( nTempDays < MAX_DAYS )
{
nTempDays++;
DaysToDate( nTempDays, nDay, nMonth, nYear );
nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
}
return *this;
}
Date& Date::operator --()
{
sal_uInt16 nDay;
sal_uInt16 nMonth;
sal_uInt16 nYear;
long nTempDays = GetAsNormalizedDays();
if ( nTempDays > 1 )
{
nTempDays--;
DaysToDate( nTempDays, nDay, nMonth, nYear );
nDate = ((sal_uIntPtr)nDay) + (((sal_uIntPtr)nMonth)*100) + (((sal_uIntPtr)nYear)*10000);
}
return *this;
}
Date Date::operator ++( int )
{
Date aOldDate = *this;
Date::operator++();
return aOldDate;
}
Date Date::operator --( int )
{
Date aOldDate = *this;
Date::operator--();
return aOldDate;
}
Date operator +( const Date& rDate, long nDays )
{
Date aDate( rDate );
aDate += nDays;
return aDate;
}
Date operator -( const Date& rDate, long nDays )
{
Date aDate( rDate );
aDate -= nDays;
return aDate;
}
long operator -( const Date& rDate1, const Date& rDate2 )
{
sal_uIntPtr nTempDays1 = rDate1.GetAsNormalizedDays();
sal_uIntPtr nTempDays2 = rDate2.GetAsNormalizedDays();
return nTempDays1 - nTempDays2;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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