public Proxy(DateValue value)
{
_value = value;
}
public static DateValue Add(DateValue dat, DayTimeDurationValue duration)
{
try
{
decimal seconds = (decimal)duration.LowPartValue.Ticks / TimeSpan.TicksPerSecond;
decimal julian = dat.ToJulianInstant();
julian += seconds;
DateTimeValue dt = DateTimeValue.CreateFromJulianInstant(julian);
if (dat.IsLocal)
return new DateValue(dt.S, dt.Value.Date);
else
return new DateValue(dt.S, new DateTimeOffset(dt.Value.Date, dat.Value.Offset));
}
catch (ArgumentOutOfRangeException)
{
throw new XQueryException(Properties.Resources.FODT0001);
}
}
private static DayTimeDurationValue Sub(DateValue dat1, DateValue dat2)
{
try
{
TimeSpan ts1;
TimeSpan ts2;
if (dat1.IsLocal && dat2.IsLocal)
{
ts1 = dat1.Value.DateTime - DateTime.MinValue;
ts2 = dat2.Value.DateTime - DateTime.MinValue;
}
else
{
ts1 = dat1.Value.ToUniversalTime().DateTime - DateTime.MinValue;
ts2 = dat2.Value.ToUniversalTime().DateTime - DateTime.MinValue;
}
if (dat1.S)
ts1 = -ts1;
if (dat2.S)
ts2 = -ts2;
return new DayTimeDurationValue(ts1 - ts2);
}
catch (OverflowException)
{
throw new XQueryException(Properties.Resources.FODT0001);
}
}
public static DateValue Add(DateValue dat, YearMonthDurationValue duration)
{
try
{
Calendar calender = CultureInfo.InvariantCulture.Calendar;
DateTime dt = dat.Value.DateTime;
int year = dat.S ? -dt.Year : dt.Year - 1;
int m = (dt.Month - 1) + duration.Months;
year = year + duration.Years + m / 12;
if (year >= 0)
year = year + 1;
m = m % 12;
if (m < 0)
{
m += 12;
year -= 1;
}
m++;
int day = Math.Min(dt.Day, calender.GetDaysInMonth(Math.Abs(year), m));
if (year < 0)
dt = new DateTime(-year, m, day);
else
dt = new DateTime(year, m, day);
if (dat.IsLocal)
return new DateValue(year < 0, dt);
else
return new DateValue(year < 0, new DateTimeOffset(dt, dat.Value.Offset));
}
catch (ArgumentOutOfRangeException)
{
throw new XQueryException(Properties.Resources.FODT0001);
}
}
