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#include "convert.h"
#include <contrib/libs/cctz/include/cctz/civil_time.h>
#include <util/generic/yexception.h>
#include <chrono>
namespace NDatetime {
static constexpr i64 TM_YEAR_OFFSET = 1900;
using TSystemClock = std::chrono::system_clock;
using TTimePoint = std::chrono::time_point<TSystemClock>;
static TSimpleTM CivilToTM(const cctz::civil_second& cs, const cctz::time_zone::absolute_lookup& al) {
cctz::civil_day cd(cs);
TSimpleTM tm;
tm.GMTOff = al.offset;
tm.Year = cs.year() - TM_YEAR_OFFSET;
tm.YDay = cctz::get_yearday(cd);
tm.Mon = cs.month() - 1;
tm.MDay = cs.day();
tm.Hour = cs.hour();
tm.Min = cs.minute();
tm.Sec = cs.second();
tm.IsDst = al.is_dst;
tm.IsLeap = LeapYearAD(cs.year());
switch (cctz::get_weekday(cd)) {
case cctz::weekday::monday:
tm.WDay = 1;
break;
case cctz::weekday::tuesday:
tm.WDay = 2;
break;
case cctz::weekday::wednesday:
tm.WDay = 3;
break;
case cctz::weekday::thursday:
tm.WDay = 4;
break;
case cctz::weekday::friday:
tm.WDay = 5;
break;
case cctz::weekday::saturday:
tm.WDay = 6;
break;
case cctz::weekday::sunday:
tm.WDay = 0;
break;
}
return tm;
}
/*
TTimeZone GetTimeZone(const TString& name) {
TTimeZone result;
if (!cctz::load_time_zone(name, &result)) {
ythrow yexception() << "Failed to load time zone " << name << ", " << result.name();
}
return result;
}
*/
TTimeZone GetUtcTimeZone() {
return cctz::utc_time_zone();
}
TTimeZone GetLocalTimeZone() {
return cctz::local_time_zone();
}
TSimpleTM ToCivilTime(const TInstant& absoluteTime, const TTimeZone& tz) {
TTimePoint tp = TSystemClock::from_time_t(absoluteTime.TimeT());
return CivilToTM(cctz::convert(tp, tz), tz.lookup(tp));
}
TSimpleTM CreateCivilTime(const TTimeZone& tz, ui32 year, ui32 mon, ui32 day, ui32 h, ui32 m, ui32 s) {
cctz::civil_second cs(year, mon, day, h, m, s);
return CivilToTM(cs, tz.lookup(tz.lookup(cs).pre));
}
TInstant ToAbsoluteTime(const TSimpleTM& civilTime, const TTimeZone& tz) {
cctz::civil_second cs(
civilTime.Year + TM_YEAR_OFFSET,
civilTime.Mon + 1,
civilTime.MDay,
civilTime.Hour,
civilTime.Min,
civilTime.Sec);
return TInstant::Seconds(TSystemClock::to_time_t(tz.lookup(cs).pre));
}
}
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