tools/source/datetime/datetime.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19 #include <tools/datetime.hxx>
  20 #include <rtl/math.hxx>
  21
  22 #include <systemdatetime.hxx>
  23
  24 DateTime::DateTime(DateTimeInitSystem)
  25     : Date( Date::EMPTY )
  26     , Time( Time::EMPTY )
  27 {
  28     sal_Int32 nD = 0;
  29     sal_Int64 nT = 0;
  30     if ( GetSystemDateTime( &nD, &nT ) )
  31     {
  32         Date::operator=( Date( nD ) );
  33         SetTime( nT );
  34     }
  35     else
  36         Date::operator=( Date( 1, 1, 1900 ) ); // Time::nTime is already 0
  37 }
  38
  39 DateTime::DateTime( const css::util::DateTime& rDateTime )
  40   : Date( rDateTime.Day, rDateTime.Month, rDateTime.Year ),
  41     Time( rDateTime.Hours, rDateTime.Minutes, rDateTime.Seconds, rDateTime.NanoSeconds )
  42 {
  43 }
  44
  45 DateTime& DateTime::operator =( const css::util::DateTime& rUDateTime )
  46 {
  47     Date::operator=( Date( rUDateTime.Day, rUDateTime.Month, rUDateTime.Year));
  48     Time::operator=( Time( rUDateTime));
  49     return *this;
  50 }
  51
  52 bool DateTime::IsBetween( const DateTime& rFrom, const DateTime& rTo ) const
  53 {
  54     if ( (*this >= rFrom) && (*this <= rTo) )
  55         return true;
  56     else
  57         return false;
  58 }
  59
  60 bool DateTime::operator >( const DateTime& rDateTime ) const
  61 {
  62     if ( (Date::operator>( rDateTime )) ||
  63          (Date::operator==( rDateTime ) && tools::Time::operator>( rDateTime )) )
  64         return true;
  65     else
  66         return false;
  67 }
  68
  69 bool DateTime::operator <( const DateTime& rDateTime ) const
  70 {
  71     if ( (Date::operator<( rDateTime )) ||
  72          (Date::operator==( rDateTime ) && tools::Time::operator<( rDateTime )) )
  73         return true;
  74     else
  75         return false;
  76 }
  77
  78 bool DateTime::operator >=( const DateTime& rDateTime ) const
  79 {
  80     if ( (Date::operator>( rDateTime )) ||
  81          (Date::operator==( rDateTime ) && tools::Time::operator>=( rDateTime )) )
  82         return true;
  83     else
  84         return false;
  85 }
  86
  87 bool DateTime::operator <=( const DateTime& rDateTime ) const
  88 {
  89     if ( (Date::operator<( rDateTime )) ||
  90          (Date::operator==( rDateTime ) && tools::Time::operator<=( rDateTime )) )
  91         return true;
  92     else
  93         return false;
  94 }
  95
  96 sal_Int64 DateTime::GetSecFromDateTime( const Date& rDate ) const
  97 {
  98     if ( Date::operator<( rDate ) )
  99         return 0;
 100     else
 101     {
 102         sal_Int64 nSec = Date( *this ) - rDate;
 103         nSec *= 24UL*60*60;
 104         sal_Int64 nHour = GetHour();
 105         sal_Int64 nMin  = GetMin();
 106         nSec += (nHour*3600)+(nMin*60)+GetSec();
 107         return nSec;
 108     }
 109 }
 110
 111 DateTime& DateTime::operator +=( const tools::Time& rTime )
 112 {
 113     tools::Time aTime = *this;
 114     aTime += rTime;
 115     sal_uInt16 nHours = aTime.GetHour();
 116     if ( aTime.GetTime() > 0 )
 117     {
 118         while ( nHours >= 24 )
 119         {
 120             Date::operator++();
 121             nHours -= 24;
 122         }
 123         aTime.SetHour( nHours );
 124     }
 125     else if ( aTime.GetTime() != 0 )
 126     {
 127         while ( nHours >= 24 )
 128         {
 129             Date::operator--();
 130             nHours -= 24;
 131         }
 132         Date::operator--();
 133         aTime = Time( 24, 0, 0 )+aTime;
 134     }
 135     tools::Time::operator=( aTime );
 136
 137     return *this;
 138 }
 139
 140 DateTime& DateTime::operator -=( const tools::Time& rTime )
 141 {
 142     tools::Time aTime = *this;
 143     aTime -= rTime;
 144     sal_uInt16 nHours = aTime.GetHour();
 145     if ( aTime.GetTime() > 0 )
 146     {
 147         while ( nHours >= 24 )
 148         {
 149             Date::operator++();
 150             nHours -= 24;
 151         }
 152         aTime.SetHour( nHours );
 153     }
 154     else if ( aTime.GetTime() != 0 )
 155     {
 156         while ( nHours >= 24 )
 157         {
 158             Date::operator--();
 159             nHours -= 24;
 160         }
 161         Date::operator--();
 162         aTime = Time( 24, 0, 0 )+aTime;
 163     }
 164     tools::Time::operator=( aTime );
 165
 166     return *this;
 167 }
 168
 169 DateTime operator +( const DateTime& rDateTime, sal_Int32 nDays )
 170 {
 171     DateTime aDateTime( rDateTime );
 172     aDateTime.AddDays( nDays );
 173     return aDateTime;
 174 }
 175
 176 DateTime operator -( const DateTime& rDateTime, sal_Int32 nDays )
 177 {
 178     DateTime aDateTime( rDateTime );
 179     aDateTime.AddDays( -nDays );
 180     return aDateTime;
 181 }
 182
 183 DateTime operator +( const DateTime& rDateTime, const tools::Time& rTime )
 184 {
 185     DateTime aDateTime( rDateTime );
 186     aDateTime += rTime;
 187     return aDateTime;
 188 }
 189
 190 DateTime operator -( const DateTime& rDateTime, const tools::Time& rTime )
 191 {
 192     DateTime aDateTime( rDateTime );
 193     aDateTime -= rTime;
 194     return aDateTime;
 195 }
 196
 197 void DateTime::AddTime( double fTimeInDays )
 198 {
 199     double fInt, fFrac;
 200     if ( fTimeInDays < 0.0 )
 201     {
 202         fInt = ::rtl::math::approxCeil( fTimeInDays );
 203         fFrac = fInt <= fTimeInDays ? 0.0 : fTimeInDays - fInt;
 204     }
 205     else
 206     {
 207         fInt = ::rtl::math::approxFloor( fTimeInDays );
 208         fFrac = fInt >= fTimeInDays ? 0.0 : fTimeInDays - fInt;
 209     }
 210     AddDays( sal_Int32(fInt) );     // full days
 211     if ( fFrac )
 212     {
 213         tools::Time aTime(0);  // default ctor calls system time, we don't need that
 214         fFrac *= ::tools::Time::nanoSecPerDay;   // time expressed in nanoseconds
 215         aTime.MakeTimeFromNS( static_cast<sal_Int64>(fFrac) );    // method handles negative ns
 216         operator+=( aTime );
 217     }
 218 }
 219
 220 DateTime operator +( const DateTime& rDateTime, double fTimeInDays )
 221 {
 222     DateTime aDateTime( rDateTime );
 223     aDateTime.AddTime( fTimeInDays );
 224     return aDateTime;
 225 }
 226
 227 double operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 )
 228 {
 229     sal_Int32 nDays = static_cast<const Date&>(rDateTime1)
 230         - static_cast<const Date&>(rDateTime2);
 231     sal_Int64 nTime = rDateTime1.GetNSFromTime() - rDateTime2.GetNSFromTime();
 232     if ( nTime )
 233     {
 234         double fTime = double(nTime);
 235         fTime /= ::tools::Time::nanoSecPerDay; // convert from nanoseconds to fraction
 236         if ( nDays < 0 && fTime > 0.0 )
 237             fTime = 1.0 - fTime;
 238         return double(nDays) + fTime;
 239     }
 240     return double(nDays);
 241 }
 242
 243 void DateTime::GetWin32FileDateTime( sal_uInt32 & rLower, sal_uInt32 & rUpper ) const
 244 {
 245     const sal_Int64 a100nPerSecond = SAL_CONST_INT64( 10000000 );
 246     const sal_Int64 a100nPerDay = a100nPerSecond * sal_Int64( 60 * 60 * 24 );
 247
 248     // FILETIME is indirectly documented as uint64, see
 249     // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724284.aspx
 250     // mentioning the ULARGE_INTEGER structure.
 251     // https://msdn.microsoft.com/en-us/library/windows/desktop/ms724280.aspx
 252     // mentions that if FILETIME is not less than 0x8000000000000000 then the
 253     // FileTimeToSystemTime function fails, which is another indicator.
 254     // Unless there's evidence that FILETIME can represent a signed offset from
 255     // 1601-01-01 truncate at 0. (reading part below in
 256     // CreateFromWin32FileDateTime() would had to be adapted to signed as
 257     // well).
 258     sal_Int16 nYear = GetYear();
 259     SAL_WARN_IF( nYear < 1601, "tools.datetime", "DateTime::GetWin32FileDateTime - year < 1601: " << nYear);
 260
 261     sal_Int64 aTime = (nYear < 1601 ? 0 : (
 262         a100nPerDay * (*this - Date(1,1,1601)) +
 263         GetNSFromTime()/100));
 264
 265     rLower = sal_uInt32( aTime % SAL_CONST_UINT64( 0x100000000 ) );
 266     rUpper = sal_uInt32( aTime / SAL_CONST_UINT64( 0x100000000 ) );
 267 }
 268
 269 DateTime DateTime::CreateFromWin32FileDateTime( sal_uInt32 rLower, sal_uInt32 rUpper )
 270 {
 271     // (rUpper|rLower) = 100-nanosecond intervals since 1601-01-01 00:00
 272     const sal_uInt64 a100nPerSecond = SAL_CONST_UINT64( 10000000 );
 273     const sal_uInt64 a100nPerDay = a100nPerSecond * sal_uInt64( 60 * 60 * 24 );
 274
 275     sal_uInt64 aTime =
 276             sal_uInt64( rUpper ) * SAL_CONST_UINT64( 0x100000000 ) +
 277             sal_uInt64( rLower );
 278
 279     SAL_WARN_IF( static_cast<sal_Int64>(aTime) < 0, "tools.datetime",
 280             "DateTime::CreateFromWin32FileDateTime - absurdly high value expected?");
 281
 282     sal_uInt64 nDays = aTime / a100nPerDay;
 283
 284     Date aDate(1,1,1601);
 285     // (0xffffffffffffffff / a100nPerDay = 21350398) fits into sal_Int32
 286     // (0x7fffffff = 2147483647)
 287     aDate.AddDays(nDays);
 288
 289     SAL_WARN_IF( aDate - Date(1,1,1601) != static_cast<sal_Int32>(nDays), "tools.datetime",
 290             "DateTime::CreateFromWin32FileDateTime - date truncated to max");
 291
 292     sal_uInt64 nNanos = (aTime - (nDays * a100nPerDay)) * 100;
 293     return DateTime( aDate, tools::Time(
 294                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerHour)   % sal_uInt64( 24 )),
 295                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerMinute) % sal_uInt64( 60 )),
 296                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerSec)    % sal_uInt64( 60 )),
 297                 static_cast<sal_uInt64>( nNanos % tools::Time::nanoSecPerSec)));
 298 }
 299
 300 DateTime DateTime::CreateFromUnixTime(const double fSecondsSinceEpoch)
 301 {
 302     double fValue = fSecondsSinceEpoch / Time::secondPerDay;
 303     const sal_Int32 nDays = static_cast <sal_Int32>(::rtl::math::approxFloor(fValue));
 304
 305     Date aDate (1, 1, 1970);
 306     aDate.AddDays(nDays);
 307     SAL_WARN_IF(aDate - Date(1, 1, 1970) != static_cast<sal_Int32>(nDays), "tools.datetime",
 308                 "DateTime::CreateFromUnixTime - date truncated to max");
 309
 310     fValue -= nDays;
 311
 312     const sal_uInt64 nNanos = fValue * tools::Time::nanoSecPerDay;
 313     return DateTime( aDate, tools::Time(
 314                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerHour)   % sal_uInt64( 24 )),
 315                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerMinute) % sal_uInt64( 60 )),
 316                 static_cast<sal_uInt32>((nNanos / tools::Time::nanoSecPerSec)    % sal_uInt64( 60 )),
 317                 static_cast<sal_uInt64>( nNanos % tools::Time::nanoSecPerSec)));
 318 }
 319
 320 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */