private static void CheckDay(int year, Month month, int day)
{
int minDay = 1;
int maxDay = month.Days(YearUtil.IsLeapYear(year));
if (day < minDay || day > maxDay)
{
throw new ArgumentOutOfRangeException($"{nameof(day)} must be between {minDay} and {maxDay} for the month {month.Name(new CultureInfo("en-US"))}");
}
}
/// <summary>
/// Returns a new <see cref="LocalDate" /> with the specified year.
/// If the day of month is invalid for the new year, it will be changed to the last valid day of the month.
/// </summary>
/// <param name="year"></param>
/// <returns></returns>
public LocalDate WithYear(int year)
{
CheckYear(year);
// adjust February 29 to February 28 if the new year is not a leap year
Month month = m_month;
int day = m_day;
if (IsLeapDay && !YearUtil.IsLeapYear(year))
{
day = Month.February.Days(false);
}
return(new LocalDate(year, month, day));
}
/// <summary>
/// Returns a new <see cref="LocalDate" /> with the specified month.
/// If the day of month is invalid for the new year, it will be changed to the last valid day of the month.
/// </summary>
/// <param name="month"></param>
/// <returns></returns>
public LocalDate WithMonth(Month month)
{
CheckMonth(month);
// adjust to the last valid day of the month, if the new month has fewer days than the old month
int year = m_year;
int day = m_day;
int daysOfMonth = month.Days(YearUtil.IsLeapYear(m_year));
if (daysOfMonth < day)
{
day = daysOfMonth;
}
return(new LocalDate(year, month, day));
}