public CalendarDateTimeDuration(CalendarDateDuration dateDuration, TimeDuration timeDuration)
{
if (dateDuration == null)
{
throw new ArgumentNullException(nameof(dateDuration));
}
if (timeDuration == null)
{
throw new ArgumentNullException(nameof(timeDuration));
}
_dateDuration = dateDuration;
_timeDuration = timeDuration;
}
public static CalendarDate Add(CalendarDate x, CalendarDateDuration y)
{
var day = x.Day;
var month = x.Month;
var year = x.Year;
var century = x.Century;
var precision = x.Precision;
if (y.Centuries != null)
{
century += y.Centuries.Value;
}
year += y.Years;
if (y.Months != null)
{
month += y.Months.Value;
if (precision < CalendarDatePrecision.Month)
{
precision = CalendarDatePrecision.Month;
}
}
if (y.Days != null)
{
day += y.Days.Value;
if (precision < CalendarDatePrecision.Day)
{
precision = CalendarDatePrecision.Day;
}
}
while (month > 12)
{
month -= 12;
year++;
}
var daysInMonth = DaysInMonth(year, month);
while (day > daysInMonth)
{
day -= daysInMonth;
month++;
daysInMonth = DaysInMonth(year, month);
}
switch (precision)
{
case CalendarDatePrecision.Century:
return CalendarDate.FromCentury(century);
case CalendarDatePrecision.Year:
return new CalendarDate(year);
case CalendarDatePrecision.Month:
return new CalendarDate(year, month);
case CalendarDatePrecision.Day:
return new CalendarDate(year, month, day);
default:
return null;
}
}
public static CalendarDate Subtract(CalendarDate x, CalendarDateDuration y)
{
long century = x.Century;
long year = x.Year - y.Years;
double month = x.Month;
double day = x.Day;
CalendarDatePrecision precision = x.Precision;
if (y.Days != null)
{
day -= y.Days.Value;
if (precision < CalendarDatePrecision.Day)
{
precision = CalendarDatePrecision.Day;
}
}
if (y.Months != null)
{
month -= y.Months.Value;
if (precision < CalendarDatePrecision.Month)
{
precision = CalendarDatePrecision.Month;
}
}
while (month < 1)
{
month += MonthsPerYear;
year--;
}
while (day < 1)
{
day += DaysInMonth(year, (int)month);
month--;
}
switch (precision)
{
case CalendarDatePrecision.Century:
return CalendarDate.FromCentury(century);
case CalendarDatePrecision.Year:
return new CalendarDate(year);
case CalendarDatePrecision.Month:
return new CalendarDate(year, (int)month);
case CalendarDatePrecision.Day:
return new CalendarDate(year, (int)month, (int)day);
default:
return null;
}
}
public static CalendarDateTime Add(CalendarDateTime x, CalendarDateDuration y)
{
double day = x.Day;
double month = x.Month;
double year = x.Year;
var second = x.Second;
var minute = x.Minute;
var hour = x.Hour;
var precision = x.Precision;
year += y.Years;
if (y.Months != null)
{
month += y.Months.Value;
}
if (y.Days != null)
{
day += y.Days.Value;
}
while ((int)month > MonthsPerYear)
{
month -= MonthsPerYear;
year++;
}
int daysInMonth = DaysInMonth((long)year, (int)month);
while (day > daysInMonth)
{
day -= daysInMonth;
month++;
daysInMonth = DaysInMonth((long)year, (int)month);
}
switch (precision)
{
case TimePrecision.Hour:
return new CalendarDateTime(new CalendarDate((long)year, (int)month, (int)day), new Time(hour));
case TimePrecision.Minute:
return new CalendarDateTime(new CalendarDate((long)year, (int)month, (int)day), new Time((int)hour, minute));
case TimePrecision.Second:
return new CalendarDateTime(new CalendarDate((long)year, (int)month, (int)day), new Time((int)hour, (int)minute, second));
default:
return null;
}
}
public static CalendarDateTime Subtract(CalendarDateTime x, CalendarDateDuration y)
{
long year = x.Year - y.Years;
double month = x.Month;
double day = x.Day;
double hour = x.Hour;
double minute = x.Minute;
double second = x.Second;
TimePrecision precision = x.Precision;
if (y.Months != null)
{
month -= y.Months.Value;
if (month != (int)month)
{
day += (month - (int)month) * DaysInMonth(year, (int)month);
month = (int)month;
}
}
if (y.Days != null)
{
day -= (int)y.Days.Value;
if (day != (int)day)
{
hour += (day - (int)day) * HoursPerDay;
day = (int)day;
}
}
while (second <= -SecondsPerMinute)
{
second += SecondsPerMinute;
minute--;
}
while (minute <= -MinutesPerHour)
{
minute += MinutesPerHour;
hour--;
}
while (hour <= -HoursPerDay)
{
hour += HoursPerDay;
day--;
}
while (month < 1)
{
month += MonthsPerYear;
year--;
}
while (day < 1)
{
day += DaysInMonth(year, (int)month);
month--;
}
switch (precision)
{
case TimePrecision.Hour:
return new CalendarDateTime(new CalendarDate(year, (int)month, (int)day), new Time(hour));
case TimePrecision.Minute:
return new CalendarDateTime(new CalendarDate(year, (int)month, (int)day), new Time((int)hour, minute));
case TimePrecision.Second:
return new CalendarDateTime(new CalendarDate(year, (int)month, (int)day), new Time((int)hour, (int)minute, second));
default:
return null;
}
}
