xlnt/source/datetime.cpp

173 lines
4.6 KiB
C++

#include <cmath>
#include <ctime>
#include "common/datetime.hpp"
namespace xlnt {
time time::from_number(long double raw_time, int base_year)
{
double integer_part;
double fractional_part = std::modf((double)raw_time, &integer_part);
fractional_part *= 24;
int hour = (int)fractional_part;
fractional_part = 60 * (fractional_part - hour);
int minute = (int)fractional_part;
fractional_part = 60 * (fractional_part - minute);
int second = (int)fractional_part;
fractional_part = 1000000 * (fractional_part - second);
int microsecond = (int)fractional_part;
if(microsecond == 999999 && fractional_part - microsecond > 0.5)
{
microsecond = 0;
second += 1;
if(second == 60)
{
second = 0;
minute += 1;
if(minute == 60)
{
minute = 0;
hour += 1;
}
}
}
return time(hour, minute, second, microsecond);
}
date date::from_number(long double number, int base_year)
{
int year = (int)number / 365;
number -= year * 365;
int month = (int)number / 30;
number -= month * 30;
int day = (int)number;
return date(year + base_year, month, day + 1);
}
datetime datetime::from_number(long double raw_time, int base_year)
{
double integer_part;
double fractional_part = std::modf((double)raw_time, &integer_part);
fractional_part *= 24;
int hour = (int)fractional_part;
fractional_part = 60 * (fractional_part - hour);
int minute = (int)fractional_part;
fractional_part = 60 * (fractional_part - minute);
int second = (int)fractional_part;
fractional_part = 1000000 * (fractional_part - second);
int microsecond = (int)fractional_part;
if(microsecond == 999999 && fractional_part - microsecond > 0.5)
{
microsecond = 0;
second += 1;
if(second == 60)
{
second = 0;
minute += 1;
if(minute == 60)
{
minute = 0;
hour += 1;
}
}
}
int year = (int)integer_part / 365;
integer_part -= year * 365;
int month = (int)integer_part / 30;
integer_part -= month * 30;
int day = (int)integer_part;
return datetime(year + base_year, month, day + 1, hour, minute, second, microsecond);
}
bool date::operator==(const date &comparand) const
{
return year == comparand.year
&& month == comparand.month
&& day == comparand.day;
}
bool time::operator==(const time &comparand) const
{
return hour == comparand.hour
&& minute == comparand.minute
&& second == comparand.second
&& microsecond == comparand.microsecond;
}
bool datetime::operator==(const datetime &comparand) const
{
return year == comparand.year
&& month == comparand.month
&& day == comparand.day
&& hour == comparand.hour
&& minute == comparand.minute
&& second == comparand.second
&& microsecond == comparand.microsecond;
}
time::time(const std::string &time_string) : hour(0), minute(0), second(0), microsecond(0)
{
std::string remaining = time_string;
auto colon_index = remaining.find(':');
hour = std::stoi(remaining.substr(0, colon_index));
remaining = remaining.substr(colon_index + 1);
colon_index = remaining.find(':');
minute = std::stoi(remaining.substr(0, colon_index));
colon_index = remaining.find(':');
if(colon_index != std::string::npos)
{
remaining = remaining.substr(colon_index + 1);
second = std::stoi(remaining);
}
}
double time::to_number(int base_year) const
{
double number = microsecond;
number /= 1000000;
number += second;
number /= 60;
number += minute;
number /= 60;
number += hour;
number /= 24;
return number;
}
double date::to_number(int base_year) const
{
double number = (day - 1) + month * 30 + (year - base_year) * 365;
return number;
}
double datetime::to_number(int base_year) const
{
double number = microsecond;
number /= 1000000;
number += second;
number /= 60;
number += minute;
number /= 60;
number += hour;
number /= 24;
number += (day - 1) + month * 30 + (year - base_year) * 365;
return number;
}
date date::today()
{
std::time_t raw_time = std::time(0);
std::tm now = *std::localtime(&raw_time);
return date(now.tm_year, now.tm_mon + 1, now.tm_mday);
}
datetime datetime::now()
{
std::time_t raw_time = std::time(0);
std::tm now = *std::localtime(&raw_time);
return datetime(now.tm_year, now.tm_mon + 1, now.tm_mday, now.tm_hour, now.tm_min, now.tm_sec);
}
} // namespace xlnt