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95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
#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::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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}
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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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} // namespace xlnt
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