public static ExtendedDateTime AddMonths(ExtendedDateTime e, int monthsToAdd, DayExceedsDaysInMonthStrategy dayExceedsDaysInMonthStrategy)
{
var monthTotal = e.Month + monthsToAdd;
var month = monthTotal % 12;
if (month == 0)
{
month = 12;
}
var year = e.Year + (monthTotal - 1) / 12;
var day = e.Day;
if (day > DaysInMonth(year, month))
{
switch (dayExceedsDaysInMonthStrategy)
{
case DayExceedsDaysInMonthStrategy.RoundDown:
day = DaysInMonth(year, month);
break;
case DayExceedsDaysInMonthStrategy.Overflow:
day = day - DaysInMonth(year, month);
monthTotal = month + 1;
month = monthTotal % 12;
if (month == 0)
{
month = 12;
}
year = e.Year + (monthTotal - 1) / 12;
break;
}
}
var extendedDateTime = new ExtendedDateTime(year, month, e.Day, e.Hour, e.Minute, e.Second, e.UtcOffset.Hours, e.UtcOffset.Minutes);
extendedDateTime.YearFlags = e.YearFlags;
extendedDateTime.MonthFlags = e.MonthFlags;
extendedDateTime.DayFlags = e.DayFlags;
extendedDateTime.Precision = e.Precision;
return(extendedDateTime);
}
public ExtendedDateTime AddMonths(int count, DayExceedsDaysInMonthStrategy dayExceedsDaysInMonthStrategy = DayExceedsDaysInMonthStrategy.RoundDown)
{
return(ExtendedDateTimeCalculator.AddMonths(this, count, dayExceedsDaysInMonthStrategy));
}
