/// <inheritdoc/>
public override bool IsThisFestival(DateTime date)
{
var cdate = ChineseDate.From(date);
var festival = ChineseDate.From(cdate.Year, Month, Day);
return(cdate == festival);
}
/// <inheritdoc/>
protected override bool TryGetDate(int year, int month, int day, out DateTime date)
{
try
{
date = ChineseDate.From(year, month, day).ToDate();
return(true);
}
catch (Exception)
{
date = DateTime.Now;
return(false);
}
}
/// <summary>
/// 指定年月日索引，月/日可以为负数，负数表示倒数
/// </summary>
/// <param name="year">年份，范围为1901-2100</param>
/// <param name="month">月份，允许值：1-12（当年不含闰月），1-13（当年含闰月）</param>
/// <param name="day">日期，允许值：1-30（大月），1-29（小月）</param>
/// <exception cref="ArgumentOutOfRangeException">日期超出范围</exception>
/// <returns>农历日期</returns>
public static ChineseDate FromIndex(int year, int month, int day)
{
if (year < 1901 || year > 2100)
{
throw new ArgumentOutOfRangeException($"年份超出范围 1901 -- 2100");
}
var months = chineseCalendar.GetMonthsInYear(year);
if (month == 0 || month > months)
{
throw new ArgumentOutOfRangeException($"{year}年，月份允许范围为 1 -- {months}");
}
if (month < 0 - months)
{
throw new ArgumentOutOfRangeException($"{year}年，月份允许范围为 -1 -- {0 - months}");
}
if (month < 0)
{
month = months + month + 1;
}
var days = chineseCalendar.GetDaysInMonth(year, month);
if (day == 0 || day > days)
{
throw new ArgumentOutOfRangeException($"日期允许范围为 1 -- {days}");
}
if (day < 0 - days)
{
throw new ArgumentOutOfRangeException($"日期允许范围为 -1 -- {0 - days}");
}
if (day < 0)
{
day = days + day + 1;
}
var cdate = new ChineseDate();
cdate.Year = year;
cdate.MonthIndex = cdate.Month = month;
cdate.Day = day;
int leapMonth = chineseCalendar.GetLeapMonth(year);
cdate.IsLeapMonth = leapMonth == cdate.MonthIndex;
if (cdate.Month >= leapMonth && leapMonth > 0)
{
cdate.Month--;
}
cdate.LeapMonthOfYear = Math.Max(0, leapMonth - 1);
return(cdate);
}
/// <summary>
/// 转换一个公历日期为农历日期
/// </summary>
/// <param name="date">公历日期</param>
/// <exception cref="ArgumentOutOfRangeException">日期超出范围</exception>
/// <returns>农历日期</returns>
public static ChineseDate From(DateTime date)
{
try
{
var cdate = new ChineseDate();
cdate.Year = chineseCalendar.GetYear(date);
cdate.MonthIndex = cdate.Month = chineseCalendar.GetMonth(date);
cdate.Day = chineseCalendar.GetDayOfMonth(date);
//获取闰月， 0 则表示没有闰月
int leapMonth = chineseCalendar.GetLeapMonth(cdate.Year);
cdate.IsLeapMonth = leapMonth == cdate.Month;
if (cdate.Month >= leapMonth && leapMonth > 0)
{
cdate.Month--;
}
cdate.LeapMonthOfYear = Math.Max(0, leapMonth - 1);
return(cdate);
}
catch (ArgumentOutOfRangeException ex)
{
throw new ArgumentOutOfRangeException($"日期超出范围 1901-02-19(公历) -- 2101-01-28(公历)", ex);
}
}