datetimetools.cpp

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/*****************************************************************************
    NumeRe: Framework fuer Numerische Rechnungen
    Copyright (C) 2021  Erik Haenel et al.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
 
#include "datetimetools.hpp"
#include "date/iso_week.h"
#include "windows.h"
 
time_stamp::time_stamp()
{
    m_hours = std::chrono::hours(0);
    m_minutes = std::chrono::minutes(0);
    m_seconds = std::chrono::seconds(0);
    m_millisecs = std::chrono::milliseconds(0);
    m_microsecs = std::chrono::microseconds(0);
}
 
 
sys_time_point sys_time_now()
{
    return std::chrono::time_point_cast<std::chrono::microseconds>(std::chrono::system_clock::now());
}
 
 
date::year_month_day dateFromTimePoint(sys_time_point tp)
{
    return date::year_month_day(date::floor<date::days>(tp));
}
 
 
date::year_month_day dateFromTime_t(__time64_t t)
{
    sys_time_point tp;
    tp += std::chrono::seconds(t);
    return dateFromTimePoint(tp);
}
 
 
time_stamp getTimeStampFromTimePoint(sys_time_point tp)
{
    time_stamp timeStamp;
 
    timeStamp.m_ymd = dateFromTimePoint(tp);
    std::chrono::nanoseconds diff = tp - date::floor<date::days>(tp);
 
    timeStamp.m_hours = std::chrono::duration_cast<std::chrono::hours>(diff);
    diff = diff - std::chrono::duration_cast<std::chrono::hours>(diff);
 
    timeStamp.m_minutes = std::chrono::duration_cast<std::chrono::minutes>(diff);
    diff = diff - std::chrono::duration_cast<std::chrono::minutes>(diff);
 
    timeStamp.m_seconds = std::chrono::duration_cast<std::chrono::seconds>(diff);
    diff = diff - std::chrono::duration_cast<std::chrono::seconds>(diff);
 
    timeStamp.m_millisecs = std::chrono::duration_cast<std::chrono::milliseconds>(diff);
    diff = diff - std::chrono::duration_cast<std::chrono::milliseconds>(diff);
 
    timeStamp.m_microsecs = std::chrono::duration_cast<std::chrono::microseconds>(diff);
 
    return timeStamp;
}
 
 
time_stamp getTimeStampFromTime_t(__time64_t t)
{
    sys_time_point tp;
    tp += std::chrono::seconds(t);
    return getTimeStampFromTimePoint(tp);
}
 
 
sys_time_point getTimePointFromTimeStamp(const time_stamp& ts)
{
    auto res = date::sys_days(ts.m_ymd)
        + ts.m_hours
        + ts.m_minutes
        + ts.m_seconds
        + ts.m_millisecs
        + ts.m_microsecs;
 
    return res;
}
 
 
__time64_t getTime_tFromTimeStamp(const time_stamp& ts)
{
    auto tp = std::chrono::time_point_cast<std::chrono::seconds>(getTimePointFromTimeStamp(ts));
    return tp.time_since_epoch().count();
}
 
 
double to_double(sys_time_point tp)
{
    return tp.time_since_epoch().count() * std::micro::num / (double)std::micro::den;
}
 
 
sys_time_point to_timePoint(double d)
{
    sys_time_point tp;
 
    tp += std::chrono::microseconds((int64_t)std::rint(d * std::micro::den / std::micro::num));
 
    return tp;
}
 
 
size_t getWeekDay(sys_time_point tp)
{
    date::sys_days _sys_days = std::chrono::time_point_cast<date::days>(tp);
    return date::weekday(_sys_days).iso_encoding();
}
 
 
size_t getWeekNum(sys_time_point tp)
{
    date::sys_days _sys_days = std::chrono::time_point_cast<date::days>(tp);
    return unsigned(iso_week::year_weeknum_weekday(_sys_days).weeknum());
}
 
 
time_zone getCurrentTimeZone()
{
    TIME_ZONE_INFORMATION timezone;
    int res = GetTimeZoneInformation(&timezone);
 
    time_zone tz;
    tz.Bias = std::chrono::minutes(timezone.Bias);
    tz.DayLightBias = res == TIME_ZONE_ID_DAYLIGHT ? std::chrono::minutes(timezone.DaylightBias) : std::chrono::minutes(0);
 
    return tz;
}