mirror of https://github.com/tfussell/xlnt
139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
// Copyright (c) 2014-2016 Thomas Fussell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, WRISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE
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//
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// @license: http://www.opensource.org/licenses/mit-license.php
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// @author: see AUTHORS file
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#include <cmath>
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#include <ctime>
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#include <xlnt/utils/date.hpp>
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namespace {
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std::tm safe_localtime(std::time_t raw_time)
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{
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#ifdef _MSC_VER
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std::tm result;
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localtime_s(&result, &raw_time);
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return result;
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#else
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return *localtime(&raw_time);
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#endif
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}
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} // namespace
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namespace xlnt {
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date::date(int year_, int month_, int day_)
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: year(year_), month(month_), day(day_)
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{
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}
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date date::from_number(int days_since_base_year, calendar base_date)
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{
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date result(0, 0, 0);
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if (base_date == calendar::mac_1904)
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{
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days_since_base_year += 1462;
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}
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if (days_since_base_year == 60)
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{
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result.day = 29;
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result.month = 2;
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result.year = 1900;
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return result;
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}
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else if (days_since_base_year < 60)
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{
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days_since_base_year++;
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}
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int l = days_since_base_year + 68569 + 2415019;
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int n = int((4 * l) / 146097);
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l = l - int((146097 * n + 3) / 4);
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int i = int((4000 * (l + 1)) / 1461001);
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l = l - int((1461 * i) / 4) + 31;
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int j = int((80 * l) / 2447);
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result.day = l - int((2447 * j) / 80);
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l = int(j / 11);
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result.month = j + 2 - (12 * l);
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result.year = 100 * (n - 49) + i + l;
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return result;
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}
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bool date::operator==(const date &comparand) const
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{
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return year == comparand.year && month == comparand.month && day == comparand.day;
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}
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int date::to_number(calendar base_date) const
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{
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if (day == 29 && month == 2 && year == 1900)
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{
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return 60;
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}
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int days_since_1900 = int((1461 * (year + 4800 + int((month - 14) / 12))) / 4)
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+ int((367 * (month - 2 - 12 * ((month - 14) / 12))) / 12)
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- int((3 * (int((year + 4900 + int((month - 14) / 12)) / 100))) / 4) + day - 2415019 - 32075;
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if (days_since_1900 <= 60)
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{
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days_since_1900--;
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}
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if (base_date == calendar::mac_1904)
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{
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return days_since_1900 - 1462;
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}
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return days_since_1900;
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}
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date date::today()
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{
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std::tm now = safe_localtime(std::time(0));
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return date(1900 + now.tm_year, now.tm_mon + 1, now.tm_mday);
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}
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int date::weekday() const
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{
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auto year_temp = (month == 1 || month == 2) ? year - 1 : year;
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auto month_temp = month == 1 ? 13 : month == 2 ? 14 : month;
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auto day_temp = day + 1;
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auto days = day_temp + static_cast<int>(13 * (month_temp + 1) / 5.0) + (year_temp % 100)
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+ static_cast<int>((year_temp % 100) / 4.0);
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auto gregorian = days + static_cast<int>(year_temp / 400.0) - 2 * year_temp / 100;
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auto julian = days + 5 - year_temp / 100;
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int weekday = (year_temp > 1582 ? gregorian : julian) % 7;
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return weekday == 0 ? 7 : weekday;
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}
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} // namespace xlnt
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