internal Iso8601Time Add(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Time newTime = new Iso8601Time(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.FractionalSecond > 0)
{
if (newTime.SecondUnknown)
{
throw new NotSupportedException("Cannot add a duration with fractionalSeconds when the datetime seconds unknow.");
}
if (newTime.HasFractionalSecond)
{
newTime.fractionalSecond += normalisedDuration.FractionalSecond;
NormaliseFractionalSecond(newTime);
}
else
{
newTime.fractionalSecond = normalisedDuration.FractionalSecond;
}
}
if (normalisedDuration.Seconds > 0)
{
if (newTime.SecondUnknown)
{
throw new NotSupportedException("Cannot add a duration with seconds when the time seconds unknow.");
}
newTime.second += normalisedDuration.Seconds;
NormaliseSecond(newTime);
}
if (normalisedDuration.Minutes > 0)
{
if (newTime.MinuteUnknown)
{
throw new NotSupportedException("Cannot add a duration with minutes when the time minutes unknow.");
}
newTime.minute += normalisedDuration.Minutes;
NormaliseMinute(newTime);
}
if (normalisedDuration.Hours > 0)
{
newTime.hour += normalisedDuration.Hours;
if (newTime.hour >= 24)
{
throw new ApplicationException("Invalid durtion results in the hours value greater or equal to 24.");
}
}
return(newTime);
}
internal Iso8601Date Subtract(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with days when the datetime day unknow.");
}
newDate.day -= normalisedDuration.Days;
NormaliseSubtractedDay(newDate);
}
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with months when the datetime month unknow.");
}
newDate.month -= normalisedDuration.Months;
NormaliseSubtractedMonth(newDate);
if (!newDate.DayUnknown && (newDate.day > System.DateTime.DaysInMonth(newDate.year, newDate.month)))
{
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
if (normalisedDuration.Years > 0)
{
if (normalisedDuration.Years > newDate.year)
{
throw new ApplicationException("duration.Years must not greater than the dateTime.year");
}
newDate.year -= normalisedDuration.Years;
}
return(newDate);
}
internal Iso8601Date Add(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Date newDate = new Iso8601Date(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.Months > 0)
{
if (newDate.MonthUnknown)
{
throw new NotSupportedException("Cannot add a duration with months when the datetime month unknow.");
}
newDate.month += normalisedDuration.Months;
NormaliseMonth(newDate);
if (normalisedDuration.Days <= 0)
{
if (!newDate.DayUnknown && newDate.day > System.DateTime.DaysInMonth(newDate.year, newDate.month))
{
newDate.day = System.DateTime.DaysInMonth(newDate.year, newDate.month);
}
}
}
if (normalisedDuration.Years > 0)
{
newDate.year += normalisedDuration.Years;
}
if (normalisedDuration.Days > 0)
{
if (newDate.DayUnknown)
{
throw new NotSupportedException("Cannot add a duration with days when the datetime day unknow.");
}
newDate.day += normalisedDuration.Days;
NormaliseDay(newDate);
}
return(newDate);
}
internal Iso8601Time Subtract(Iso8601Duration duration)
{
DesignByContract.Check.Require(duration != null, "duration must not be null.");
Iso8601Time newTime = new Iso8601Time(this.ToString());
Iso8601Duration normalisedDuration = Iso8601Duration.Normalise(duration);
if (normalisedDuration.FractionalSecond > 0)
{
if (newTime.SecondUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with fractionalSeconds when the time seconds unknow.");
}
if (newTime.HasFractionalSecond)
{
newTime.fractionalSecond -= normalisedDuration.FractionalSecond;
}
else
{
newTime.fractionalSecond = (normalisedDuration.FractionalSecond) * -1;
}
NormaliseSubtractedFractionalSecond(newTime);
}
if (normalisedDuration.Seconds > 0)
{
if (newTime.SecondUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with seconds when the time seconds unknow.");
}
newTime.second -= normalisedDuration.Seconds;
NormaliseSubtractedSecond(newTime);
}
if (normalisedDuration.Minutes > 0)
{
if (newTime.MinuteUnknown)
{
throw new NotSupportedException("Cannot subtract a duration with minutes when the time minutes unknow.");
}
newTime.minute -= normalisedDuration.Minutes;
NormaliseSubtractedMinute(newTime);
}
if (normalisedDuration.Hours > 0)
{
newTime.hour -= normalisedDuration.Hours;
if (newTime.hour < 0)
{
throw new ApplicationException("Invalid duration results the Iso8601Time hour less than 0 after subtraction.");
}
}
return(newTime);
}