public static YearMonthDurationValue Multiply(YearMonthDurationValue a, double b)
{
if (Double.IsNaN(b) || Double.IsNegativeInfinity(b) || Double.IsPositiveInfinity(b))
throw new XQueryException(Properties.Resources.FOCA0005);
int month = (int)Math.Floor(0.5 + DaysToMonth(a.HighPartValue.Days) * b);
return new YearMonthDurationValue(new TimeSpan(MonthToDays(month), 0, 0, 0));
}
public static YearMonthDurationValue Divide(YearMonthDurationValue a, double b)
{
if (b == 0.0)
throw new XQueryException(Properties.Resources.FOAR0001);
if (Double.IsNaN(b))
throw new XQueryException(Properties.Resources.FOCA0005);
int month = (int)Math.Floor(0.5 + DaysToMonth(a.HighPartValue.Days) / b);
return new YearMonthDurationValue(new TimeSpan(MonthToDays(month), 0, 0, 0));
}
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);
}
}
public static decimal Divide(YearMonthDurationValue a, YearMonthDurationValue b)
{
int month1 = DaysToMonth(a.HighPartValue.Days);
int month2 = DaysToMonth(b.HighPartValue.Days);
if (month2 == 0)
throw new XQueryException(Properties.Resources.FOAR0001);
return (decimal)month1 / (decimal)month2;
}
public Proxy(YearMonthDurationValue value)
{
_value = value;
}