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