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#include "datetime.h"
#include <util/ysaveload.h>
#include <util/system/fasttime.h>
#include <util/datetime/base.h>
#include <util/datetime/systime.h>
#include <util/stream/output.h>
#include <util/stream/mem.h>
#include <util/string/cast.h>
#include <util/string/printf.h>
namespace NDatetime {
const ui32 MonthDays[2][12] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, //nleap
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} //leap
};
const ui32 MonthDaysNewYear[2][13] = {
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365}, //nleap
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366} //leap
};
void YDayToMonthAndDay(ui32 yday, bool isleap, ui32* month, ui32* mday) {
const ui32* begin = MonthDaysNewYear[isleap] + 1;
const ui32* end = begin + 12;
// [31, ..., 365] or [31, ..., 366] (12 elements)
const ui32* pos = UpperBound(begin, end, yday);
Y_ENSURE(pos != end, "day no. " << yday << " does not exist in " << (isleap ? "leap" : "non-leap") << " year");
*month = pos - begin;
*mday = yday - *(pos - 1) + 1;
Y_ASSERT((*month < 12) && (1 <= *mday) && (*mday <= MonthDays[isleap][*month]));
}
struct TTimeData {
i32 IsDst = 0;
i32 GMTOff = 0;
TTimeData(time_t t) {
struct ::tm tt;
::localtime_r(&t, &tt);
#ifndef _win_
GMTOff = tt.tm_gmtoff;
#else
TIME_ZONE_INFORMATION tz;
switch (GetTimeZoneInformation(&tz)) {
case TIME_ZONE_ID_UNKNOWN:
GMTOff = tz.Bias * -60;
break;
case TIME_ZONE_ID_STANDARD:
GMTOff = (tz.Bias + tz.StandardBias) * -60;
break;
case TIME_ZONE_ID_DAYLIGHT:
GMTOff = (tz.Bias + tz.DaylightBias) * -60;
break;
default:
break;
}
#endif
IsDst = tt.tm_isdst;
}
};
TSimpleTM TSimpleTM::CurrentUTC() {
return New((time_t)TInstant::MicroSeconds(InterpolatedMicroSeconds()).Seconds());
}
TSimpleTM TSimpleTM::New(time_t t, i32 gmtoff, i8 isdst) {
time_t tt = t + gmtoff + isdst * 3600;
struct tm tmSys;
Zero(tmSys);
GmTimeR(&tt, &tmSys);
tmSys.tm_isdst = isdst;
#ifndef _win_
tmSys.tm_gmtoff = gmtoff;
#endif
return New(tmSys);
}
TSimpleTM TSimpleTM::NewLocal(time_t t) {
TTimeData d(t);
return New(t, d.GMTOff, d.IsDst);
}
TSimpleTM TSimpleTM::New(const struct tm& t) {
TSimpleTM res;
res.IsDst = t.tm_isdst;
res.Sec = t.tm_sec;
res.Min = t.tm_min;
res.Hour = t.tm_hour;
res.WDay = t.tm_wday;
res.Mon = t.tm_mon;
res.MDay = t.tm_mday;
res.Year = t.tm_year;
res.YDay = t.tm_yday;
res.IsLeap = LeapYearAD(res.Year + 1900);
#ifndef _win_
res.GMTOff = t.tm_gmtoff;
#endif
return res;
}
TSimpleTM& TSimpleTM::SetRealDate(ui32 year, ui32 mon, ui32 mday, ui32 hour, ui32 min, ui32 sec, i32 isdst) {
mday = ::Max<ui32>(mday, 1);
mon = ::Min<ui32>(::Max<ui32>(mon, 1), 12);
year = ::Max<ui32>(year, 1900);
IsLeap = LeapYearAD(year);
Year = year - 1900;
Mon = mon - 1;
MDay = ::Min<ui32>(mday, MonthDays[IsLeap][Mon]);
Hour = Max<ui32>() == hour ? Hour : ::Min<ui32>(hour, 23);
Min = Max<ui32>() == min ? Min : ::Min<ui32>(min, 59);
Sec = Max<ui32>() == sec ? Sec : ::Min<ui32>(sec, 60);
IsDst = isdst;
return RegenerateFields();
}
TSimpleTM& TSimpleTM::RegenerateFields() {
return *this = New(AsTimeT(), GMTOff, IsDst);
}
TSimpleTM& TSimpleTM::Add(EField f, i32 amount) {
if (!amount) {
return *this;
}
switch (f) {
default:
return *this;
case F_DAY:
amount *= 24;
[[fallthrough]];
case F_HOUR:
amount *= 60;
[[fallthrough]];
case F_MIN:
amount *= 60;
[[fallthrough]];
case F_SEC: {
return *this = New(AsTimeT() + amount, GMTOff, IsDst);
}
case F_YEAR: {
i32 y = amount + (i32)Year;
y = ::Min<i32>(Max<i32>(y, 0), 255 /*max year*/);
// YDay may correspond to different MDay if it's March or greater and the years have different leap status
if (Mon > 1) {
YDay += (i32)LeapYearAD(RealYear()) - (i32)LeapYearAD(RealYear());
}
Year = y;
IsLeap = LeapYearAD(RealYear());
return RegenerateFields();
}
case F_MON: {
i32 m = amount + Mon;
i32 y = (m < 0 ? (-12 + m) : m) / 12;
m = m - y * 12;
if (y) {
Add(F_YEAR, y);
}
if (m >= 0 && m < 12) {
MDay = ::Min<ui32>(MonthDays[IsLeap][m], MDay);
Mon = m;
}
return RegenerateFields();
}
}
}
TString TSimpleTM::ToString(const char* fmt) const {
struct tm t = *this;
return Strftime(fmt, &t);
}
time_t TSimpleTM::AsTimeT() const {
struct tm t = AsStructTmLocal();
return TimeGM(&t) - GMTOff - IsDst * 3600;
}
struct tm TSimpleTM::AsStructTmUTC() const {
struct tm res;
Zero(res);
time_t t = AsTimeT();
return *GmTimeR(&t, &res);
}
struct tm TSimpleTM::AsStructTmLocal() const {
struct tm t;
Zero(t);
t.tm_isdst = IsDst;
t.tm_sec = Sec;
t.tm_min = Min;
t.tm_hour = Hour;
t.tm_wday = WDay;
t.tm_mon = Mon;
t.tm_mday = MDay;
t.tm_year = Year;
t.tm_yday = YDay;
#ifndef _win_
t.tm_gmtoff = GMTOff;
#endif
return t;
}
}
template <>
void In<TMonth>(IInputStream& in, TMonth& t) {
char buf[4];
LoadPodArray(&in, buf, 4);
t.Year = FromString<ui16>(buf, 4);
LoadPodArray(&in, buf, 2);
t.Month = ui8(FromString<ui16>(buf, 2)) - 1;
}
template <>
void Out<TMonth>(IOutputStream& o, const TMonth& t) {
o << t.Year << Sprintf("%.2hu", (ui16)(t.Month + 1));
}
template <>
TMonth FromStringImpl<TMonth, char>(const char* s, size_t len) {
TMonth res;
TMemoryInput in(s, len);
in >> res;
return res;
}
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