497 lines
7.6 KiB
C++
497 lines
7.6 KiB
C++
/*
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* This file is a part of PikoTools
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* and is distributed under the (new) BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2012-2018, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name Tomasz Sowa nor the names of contributors to this
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* project may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "date.h"
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// for memset
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#include <string.h>
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namespace pt
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{
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Date::Date()
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{
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Clear();
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}
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Date::Date(const Date & d)
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{
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operator=(d);
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}
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Date::Date(time_t t)
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{
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FromTime(t);
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}
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Date::Date(const tm & t)
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{
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FromTm(t);
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}
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Date::Date(const char * str)
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{
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// parsing can be break in the middle of the string (if errors)
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// and some values would not be initialized
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Clear();
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Parse(str);
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}
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Date::Date(const wchar_t * str)
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{
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Clear();
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Parse(str);
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}
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Date::Date(const std::string & str)
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{
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Clear();
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Parse(str);
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}
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Date::Date(const std::wstring & str)
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{
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Clear();
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Parse(str);
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}
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Date & Date::operator=(const Date & d)
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{
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year = d.year;
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month = d.month;
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day = d.day;
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hour = d.hour;
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min = d.min;
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sec = d.sec;
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return *this;
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}
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Date & Date::operator=(time_t t)
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{
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FromTime(t);
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return *this;
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}
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Date & Date::operator=(const tm & t)
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{
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FromTm(t);
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return *this;
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}
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Date & Date::operator=(const char * str)
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{
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Parse(str);
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return *this;
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}
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Date & Date::operator=(const wchar_t * str)
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{
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Parse(str);
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return *this;
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}
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Date & Date::operator=(const std::string & str)
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{
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Parse(str);
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return *this;
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}
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Date & Date::operator=(const std::wstring & str)
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{
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Parse(str);
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return *this;
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}
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Date Date::operator+(time_t t) const
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{
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time_t t0 = ToTime();
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Date d(t0 + t);
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return d;
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}
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Date Date::operator-(time_t t) const
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{
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time_t t0 = ToTime();
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Date d(t0 - t);
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return d;
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}
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Date & Date::operator+=(time_t t)
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{
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time_t t0 = ToTime();
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FromTime(t0 + t);
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return *this;
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}
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Date & Date::operator-=(time_t t)
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{
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time_t t0 = ToTime();
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FromTime(t0 - t);
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return *this;
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}
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void Date::Swap(Date & date)
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{
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Date temp(*this);
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*this = date;
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date = temp;
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}
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time_t Date::operator-(const Date & d) const
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{
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time_t t0 = ToTime();
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time_t t1 = d.ToTime();
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time_t res;
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if( t1 >= t0 )
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res = t1 - t0;
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else
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res = t0 - t1;
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return res;
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}
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bool Date::IsTheSameDay(const Date & d) const
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{
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return year == d.year && month == d.month && day == d.day;
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}
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bool Date::IsTheSameHour(const Date & d) const
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{
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return hour == d.hour && min == d.min && sec == d.sec;
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}
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bool Date::operator==(const Date & d) const
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{
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return IsTheSameDay(d) && IsTheSameHour(d);
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}
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bool Date::operator!=(const Date & d) const
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{
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return !operator==(d);
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}
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int Date::Compare(const Date & d) const
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{
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if( year != d.year )
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return year - d.year;
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if( month != d.month )
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return month - d.month;
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if( day != d.day )
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return day - d.day;
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if( hour != d.hour )
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return hour - d.hour;
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if( min != d.min )
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return min - d.min;
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if( sec != d.sec )
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return sec - d.sec;
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// dates are equal
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return 0;
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}
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bool Date::operator>(const Date & d) const
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{
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return Compare(d) > 0;
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}
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bool Date::operator>=(const Date & d) const
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{
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return Compare(d) >= 0;
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}
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bool Date::operator<(const Date & d) const
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{
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return Compare(d) < 0;
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}
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bool Date::operator<=(const Date & d) const
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{
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return Compare(d) <= 0;
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}
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void Date::Clear()
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{
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year = 1970;
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month = 1;
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day = 1;
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hour = 0;
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min = 0;
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sec = 0;
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}
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void Date::AssertRange(int & val, int val_min, int val_max)
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{
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if( val < val_min )
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val = val_min;
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if( val > val_max )
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val = val_max;
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}
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void Date::AssertCorrectDate()
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{
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// 10000 is only a 'cosmetic' limit
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// we can make calculations with greater values
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AssertRange(year, 1970, 10000);
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AssertRange(month, 1, 12);
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AssertRange(day, 1, MonthLen(year, month));
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AssertRange(hour, 0, 23);
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AssertRange(min, 0, 59);
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AssertRange(sec, 0, 59);
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}
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bool Date::IsCorrectDate()
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{
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// 10000 is only a 'cosmetic' limit
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// we can make calculations with greater values
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if( year < 1970 || year > 10000 )
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return false;
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if( month < 1 || month > 12 )
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return false;
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if( day < 1 || day > MonthLen(year, month) )
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return false;
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if( hour < 0 || hour > 23 )
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return false;
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if( min < 0 || min > 59 )
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return false;
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if( sec < 0 || sec > 59 )
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return false;
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return true;
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}
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int Date::MonthLen(int y, int m)
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{
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if( m == 2 && IsYearLeap(y) )
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return 29;
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const int days[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if( m>=1 && m<=12 )
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return days[m-1];
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return 0;
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}
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bool Date::IsYearLeap(int y)
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{
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return (y % 4 == 0 && y % 100 != 0) || (y % 400 == 0);
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}
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bool Date::IsYearLeap() const
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{
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return IsYearLeap(year);
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}
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/*
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return 'days' starts from 0000:03:01 (year 0, month 3 - March, day 1)
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*/
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long long Date::ToDays() const
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{
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long long m = (month + 9) % 12;
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long long y = year - m/10;
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return 365*y + y/4 - y/100 + y/400 + (m*306 + 5)/10 + (day - 1);
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}
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time_t Date::ToTime() const
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{
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time_t res = time_t((ToDays() - 719468) * 60*60*24);
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res += hour * 60 * 60;
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res += min * 60;
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res += sec;
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return res;
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}
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tm Date::ToTm() const
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{
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tm t;
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memset(&t, 0, sizeof(tm));
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t.tm_year = year - 1900;
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t.tm_mon = month - 1;
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t.tm_mday = day;
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t.tm_hour = hour;
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t.tm_min = min;
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t.tm_sec = sec;
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t.tm_wday = WeekDay();
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// t.tm_yday is not set
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return t;
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}
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/*
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this method calculates year, month and a day from given 'days'
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'days' starts from 0000:03:01 (year 0, month 3 - March, day 1)
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*/
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void Date::FromDays(long long days)
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{
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//static_assert( sizeof(long long) >= 8 , "operation here should be used at least with 64 bits precision");
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year = int(((long long)(10000)*days + 14780)/3652425);
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int delta = int(days - (365*year + year/4 - year/100 + year/400));
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if( delta < 0 )
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{
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year -= 1;
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delta = int(days - (365*year + year/4 - year/100 + year/400));
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}
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int mi = (100*delta + 52)/3060;
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month = (mi + 2)%12 + 1;
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year = year + (mi + 2)/12;
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day = delta - (mi*306 + 5)/10 + 1;
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}
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void Date::FromTime(time_t t)
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{
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time_t days = t / 60 / 60 / 24;
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time_t diff = t - days * 60 * 60 * 24;
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hour = int(diff / 60 / 60);
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min = int((diff - hour * 60 * 60) / 60);
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sec = int((diff - hour * 60 * 60 - min * 60));
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FromDays((long long)(days) + 719468);
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}
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void Date::FromTm(const tm & t)
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{
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year = t.tm_year + 1900;
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month = t.tm_mon + 1;
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day = t.tm_mday;
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hour = t.tm_hour;
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min = t.tm_min;
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sec = t.tm_sec;
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}
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int Date::WeekDay() const
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{
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long long d = ToDays();
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return (int)((d+3) % 7);
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}
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} // namespace
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