private DateTime(long ticks, TimeZone tz)
{
// check boundary conditions 1901 to 2099
if (ticks < minTicks || ticks >= maxTicks)
{
throw ArgErr.make("Ticks out of range 1901 to 2099").val;
}
// save ticks, time zone
this.m_ticks = ticks;
this.m_tz = tz;
// compute the year
int year = ticksToYear(ticks);
// get the time zone rule for this year, and
// offset the working ticks by UTC offset
TimeZone.Rule rule = m_tz.rule(year);
ticks += rule.offset * nsPerSec;
// compute the day and month; we may need to execute this
// code block up to three times:
// 1st: using standard time
// 2nd: using daylight offset (if in dst)
// 3rd: using standard time (if dst pushed us back into std)
int month, day, dstOffset = 0;
long rem;
while (true)
{
// recompute year based on working ticks
year = ticksToYear(ticks);
rem = ticks - yearTicks[year - 1900];
if (rem < 0)
{
rem += nsPerYear;
}
// compute day of the year
int dayOfYear = (int)(rem / nsPerDay);
rem %= nsPerDay;
// use lookup tables map day of year to month and day
if (isLeapYear(year))
{
month = monForDayOfYearLeap[dayOfYear];
day = dayForDayOfYearLeap[dayOfYear];
}
else
{
month = monForDayOfYear[dayOfYear];
day = dayForDayOfYear[dayOfYear];
}
// if dstOffset is set to max, then this is
// the third time thru the loop: std->dst->std
if (dstOffset == System.Int32.MaxValue)
{
dstOffset = 0; break;
}
// if dstOffset is non-zero we have run this
// loop twice to recompute the date for dst
if (dstOffset != 0)
{
// if our dst rule is wall time based, then we need to
// recompute to see if dst wall time pushed us back
// into dst - if so then run through the loop a third
// time to get us back to standard time
if (rule.isWallTime() && TimeZone.dstOffset(rule, year, month, day, (int)(rem / nsPerSec)) == 0)
{
ticks -= dstOffset * nsPerSec;
dstOffset = System.Int32.MaxValue;
continue;
}
break;
}
// first time in loop; check for daylight saving time,
// and if dst is in effect then re-run this loop with
// modified working ticks
dstOffset = TimeZone.dstOffset(rule, year, month, day, (int)(rem / nsPerSec));
if (dstOffset == 0)
{
break;
}
ticks += dstOffset * nsPerSec;
}
// compute time of day
int hour = (int)(rem / nsPerHour); rem %= nsPerHour;
int min = (int)(rem / nsPerMin); rem %= nsPerMin;
// compute weekday
int weekday = (firstWeekday(year, month) + day - 1) % 7;
// fields
int fields = 0;
fields |= ((year - 1900) & 0xff) << 0;
fields |= (month & 0xf) << 8;
fields |= (day & 0x1f) << 12;
fields |= (hour & 0x1f) << 17;
fields |= (min & 0x3f) << 22;
fields |= (weekday & 0x7) << 28;
fields |= (dstOffset != 0 ? 1 : 0) << 31;
this.m_fields = fields;
}
//////////////////////////////////////////////////////////////////////////
// Parse
//////////////////////////////////////////////////////////////////////////
internal DateTime parseDateTime(string s, TimeZone defTz, bool check)
{
try
{
// parse into fields
tzOffset = System.Int32.MaxValue;
parse(s);
// now figure out what timezone to use
TimeZone.Rule defRule = defTz.rule(year);
if (tzName != null)
{
// use defTz if tzName was specified and matches any variations of defTz
if (tzName == defTz.name() ||
tzName == defRule.stdAbbr ||
tzName == defRule.dstAbbr)
{
tz = defTz;
}
// try to map tzName to TimeZone, use defTz as fallback
else
{
tz = TimeZone.fromStr(tzName, false);
if (tz == null)
{
tz = defTz;
}
}
}
// if tzOffset was specified...
else if (tzOffset != System.Int32.MaxValue)
{
// figure out what expected offset was for defTz
int time = hour * 3600 + min * 60 + sec;
int defOffset = defRule.offset + TimeZone.dstOffset(defRule, year, (int)mon.ordinal(), day, time);
// if specified offset matches expected offset for defTz then
// use defTz, otherwise use a vanilla GMT+/- timezone
if (tzOffset == defOffset)
{
tz = defTz;
}
else
{
tz = TimeZone.fromGmtOffset(tzOffset);
}
}
// no tzName or tzOffset specified, use defTz
else
{
tz = defTz;
}
// construct DateTime
return(new DateTime(year, (int)mon.ordinal(), day, hour, min, sec, ns, tzOffset, tz));
}
catch (Exception) {}
if (check)
{
throw ParseErr.make("DateTime", s).val;
}
return(null);
}
internal DateTime(int year, int month, int day,
int hour, int min, int sec,
long ns, int knownOffset, TimeZone tz)
{
if (year < 1901 || year > 2099)
{
throw ArgErr.make("year " + year).val;
}
if (month < 0 || month > 11)
{
throw ArgErr.make("month " + month).val;
}
if (day < 1 || day > numDaysInMonth(year, month))
{
throw ArgErr.make("day " + day).val;
}
if (hour < 0 || hour > 23)
{
throw ArgErr.make("hour " + hour).val;
}
if (min < 0 || min > 59)
{
throw ArgErr.make("min " + min).val;
}
if (sec < 0 || sec > 59)
{
throw ArgErr.make("sec " + sec).val;
}
if (ns < 0 || ns > 999999999L)
{
throw ArgErr.make("ns " + ns).val;
}
// compute ticks for UTC
int doy = dayOfYear(year, month, day);
int timeInSec = hour * 3600 + min * 60 + sec;
long ticks = (long)yearTicks[year - 1900] +
(long)doy * nsPerDay +
(long)timeInSec * nsPerSec +
ns;
// adjust for timezone and dst (we might know the UTC offset)
TimeZone.Rule rule = tz.rule(year);
bool dst;
if (knownOffset == System.Int32.MaxValue)
{
// don't know offset so compute from timezone rule
ticks -= (long)rule.offset * nsPerSec;
int dstOffset = TimeZone.dstOffset(rule, year, month, day, timeInSec);
if (dstOffset != 0)
{
ticks -= (long)dstOffset * nsPerSec;
}
dst = dstOffset != 0;
}
else
{
// we known offset, still need to use rule to compute if in dst
ticks -= (long)knownOffset * nsPerSec;
dst = knownOffset != rule.offset;
}
// compute weekday
int weekday = (firstWeekday(year, month) + day - 1) % 7;
// fields
int fields = 0;
fields |= ((year - 1900) & 0xff) << 0;
fields |= (month & 0xf) << 8;
fields |= (day & 0x1f) << 12;
fields |= (hour & 0x1f) << 17;
fields |= (min & 0x3f) << 22;
fields |= (weekday & 0x7) << 28;
fields |= (dst ? 1 : 0) << 31;
// commit
this.m_ticks = ticks;
this.m_tz = tz;
this.m_fields = fields;
}
