/*----------------------------------------------------------------------------------------------
Return a variant time from this SilTime.
----------------------------------------------------------------------------------------------*/
double SilTime::VarTime(void) const
{
double vtim;
int64 msec;
// Convert to local time.
#if WIN32
msec = g_tmm.ToLcl(m_msec);
#else // WIN32
msec = 0;
// TODO-Linux: not called by views
#endif // WIN32
// Convert to an automation date.
vtim = (double)msec / kmsecPerDay + kvtimJanuary1st1601;
// vtim is the actual number of days since 0000h 12/30/1899.
// Convert this to a true Automation-style date.
if (vtim < 0.0)
{
vtim = 2.0 * floor(vtim) - vtim;
double vtimT = vtim - floor(vtim);
if (vtimT <= kvtimHalfSecond && 0.0 < vtimT)
vtim = ceil(vtim) + 1.0;
}
return vtim;
}
/*----------------------------------------------------------------------------------------------
Fill in the SilTimeInfo structure from this time.
----------------------------------------------------------------------------------------------*/
void SilTime::GetTimeInfo(SilTimeInfo * psti, bool fUtc) const
{
AssertPtr(psti);
int dyear;
int day;
int msecDay;
int yday;
int64 msec = m_msec;
if (!fUtc)
msec = g_tmm.ToLcl(msec);
// Decompose m_msec into which 400 year period it is in (relative to T0) and
// the millisecond within the 400 year period.
psti->year = (int)FloorDiv(msec, kmsecPerPeriod) * kyearPerPeriod + kyearBase;
msec = ModPos(msec, kmsecPerPeriod);
Assert(0 <= 0 && msec < kmsecPerPeriod);
// Find the day within the 400 year period.
day = (int)(msec / kmsecPerDay);
Assert(0 <= day && day < kdayPerPeriod);
// Get the time within the day.
msecDay = (int)(msec - day * (int64)kmsecPerDay);
Assert(0 <= msecDay && msecDay < kmsecPerDay);
// Find the year within the 400 year period (dyear) and the day within that year (yday).
Assert(0 <= day && day < 146097);
dyear = YearFromDayInPeriod(day, &yday);
Assert(0 <= dyear && dyear < 400);
Assert(0 <= yday && (yday < 365 || yday == 365 && SilTime::IsLeapYear(dyear + kyearBase)));
// Add dyear into the year.
psti->year += dyear;
// Find the month and day in the month.
const int * prgday = g_rgyday[IsLeapYear(psti->year)];
for (psti->ymon = 1; yday >= prgday[psti->ymon]; psti->ymon++)
;
psti->mday = yday - prgday[psti->ymon - 1] + 1;
// Calculate the week day.
// kdayMonday is used because T0 is a Monday. Note that kdayPerPeriod is divisible by 7
// so we don't have to adjust the day of the week.
psti->wday = ModPos(day + kwdayMonday, kdayPerWeek);
// Fill in the time.
psti->hour = msecDay / kmsecPerHour;
psti->min = (msecDay % kmsecPerHour) / kmsecPerMin;
psti->sec = (msecDay % kmsecPerMin) / kmsecPerSec;
psti->msec = msecDay % kmsecPerSec;
}
/*----------------------------------------------------------------------------------------------
Set this SilTime to the indicated variant time. Variant time is always in local time.
----------------------------------------------------------------------------------------------*/
void SilTime::SetToVarTime(double vtim)
{
double dbl = vtim;
// So that the arithmetic works even for negative dates, convert the
// date to the _actual number of days_ since 0000h 12/30/1899.
if (dbl < 0.0)
dbl = 2.0 * ceil(dbl) - dbl;
// Get the local time value.
dbl = (dbl - kvtimJanuary1st1601) * kmsecPerDay;
m_msec = g_tmm.ToUtc((int64)dbl);
}
/*----------------------------------------------------------------------------------------------
Return the timezone offset: local time minus utc.
----------------------------------------------------------------------------------------------*/
int SilTime::TimeZoneOffset(void) const
{
#if WIN32
return (int)((g_tmm.ToLcl(m_msec) - m_msec) / kmsecPerMin);
#else
time_t t;
struct tm *tm_lcl;
time(&t);
tm_lcl = localtime(&t);
int64 bias = tm_lcl->tm_gmtoff;
return (int) bias;
#endif
}
/*----------------------------------------------------------------------------------------------
Set the value of this SilTime according to the information in psti.
----------------------------------------------------------------------------------------------*/
void SilTime::SetTimeInfo(const SilTimeInfo & sti, bool fUtc)
{
int dyear = sti.year + FloorDiv(sti.ymon - 1, kmonPerYear) - kyearBase;
int mon = ModPos(sti.ymon - 1, kmonPerYear);
// Calculate the day number.
int64 day = (int64)365 * dyear +
FloorDiv(dyear, 4) - FloorDiv(dyear, 100) + FloorDiv(dyear, 400) +
g_rgyday[IsLeapYear(dyear + kyearBase)][mon] + sti.mday - 1;
m_msec = day * kmsecPerDay +
sti.hour * (int64)kmsecPerHour + sti.min * (int64)kmsecPerMin +
sti.sec * (int64)kmsecPerSec + sti.msec;
if (!fUtc)
m_msec = g_tmm.ToUtc(m_msec);
}
/*----------------------------------------------------------------------------------------------
Set the value of this SilTime according to the information in psti.
----------------------------------------------------------------------------------------------*/
void SilTime::SetTimeInfo(const SilTimeInfo & sti, bool fUtc)
{
int dyear = sti.year + FloorDiv(sti.ymon - 1, kmonPerYear) - kyearBase;
int mon = ModPos(sti.ymon - 1, kmonPerYear);
// Calculate the day number.
int64 day = (int64)365 * dyear +
FloorDiv(dyear, 4) - FloorDiv(dyear, 100) + FloorDiv(dyear, 400) +
g_rgyday[IsLeapYear(dyear + kyearBase)][mon] + sti.mday - 1;
m_msec = day * kmsecPerDay +
sti.hour * (int64)kmsecPerHour + sti.min * (int64)kmsecPerMin +
sti.sec * (int64)kmsecPerSec + sti.msec;
#if WIN32
if (!fUtc)
m_msec = g_tmm.ToUtc(m_msec);
#else // WIN32
if (!fUtc && (sti.year > 1970))
{
m_msec *= kfttPerMsec;
m_msec /= kfttPerSec;
m_msec -= SECS_1601_TO_1970;
time_t t = m_msec;
struct tm *tm_lcl;
tm_lcl = localtime(&t);
int64 bias = tm_lcl->tm_gmtoff;
m_msec += bias;
m_msec += SECS_1601_TO_1970;
m_msec *= kfttPerSec;
m_msec /= kfttPerMsec;
}
#endif // WIN32
}
/*----------------------------------------------------------------------------------------------
Return the timezone offset: local time minus utc.
----------------------------------------------------------------------------------------------*/
int SilTime::TimeZoneOffset(void) const
{
return (int)((g_tmm.ToLcl(m_msec) - m_msec) / kmsecPerMin);
}
