internal LuniSolarYear(int year)
{
Year = year;
//TimeZone = timeZone;
var timeZone = ILocalInfoProvider.GetLocalInfoProvider <T>().TimeZone;
// at 00:00:00 local
_month11LastYear = Moon.GetNewMoon11(Year - 1, timeZone).Date;
_month11ThisYear = Moon.GetNewMoon11(Year, timeZone).Date;
// Convert the local date to UTC date time by adding AddHours(-TimeZone).
double jdMonth11LastYear = _month11LastYear.AddHours(-timeZone).UniversalDateTimeToJulianDate();
double jdMonth11ThisYear = _month11ThisYear.AddHours(-timeZone).UniversalDateTimeToJulianDate();
int k = (int)(0.5 + (jdMonth11LastYear - 2415021.076998695) / 29.530588853);
IsLeapYear = (jdMonth11ThisYear - jdMonth11LastYear) > 365.0;
if (!IsLeapYear)
{
InitNonLeapYear(k, timeZone);
Console.WriteLine("None Leap {0}", year);
}
else
{
InitLeapYear(k, timeZone);
Console.WriteLine("Leap {0}", year);
}
}
/// <summary>
/// Returns "Giêng, Hai, Ba..." or "Giêng nhuận, Hai nhuận, Ba nhuận..." (if applicable)
/// </summary>
/// <returns></returns>
public static string GetMonthShortName(int month, bool isLeapMonth)
{
if (month < 1 || month > ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames.Length)
{
return("undefined");
}
return(ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames[month - 1] + (isLeapMonth ? " nhuận" : ""));
}
/// <summary>
/// Returns "Name (Can Chi)" or "Name (Can Chi) nhuận".
/// E.g. "Bảy (Bính Ngọ)", "Năm (Nhâm Ngọ) nhuận".
/// </summary>
/// <returns></returns>
public static string GetMonthFullName(int year, int month, bool isLeapMonth = false)
{
if (month < 1 || month > ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames.Length)
{
return("undefined");
}
return(String.Format("{0} ({1} {2}){3}", GetMonthName(month), GetMonthCelestialStemName(year, month), GetMonthTerrestrialBranchName(month), (isLeapMonth ? " nhuận" : "").ToString()));
}
/// <summary>
/// Returns "Giêng, Hai, Ba..."
/// </summary>
/// <returns></returns>
public static string GetMonthName(int month)
{
if (month < 1 || month > ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames.Length)
{
return("undefined");
}
return(ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames[month - 1]);
}
public static string GetMonthTerrestrialBranchName(int month)
{
if (month < 1 || month > ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames.Length)
{
return("undefined");
}
return(ILocalInfoProvider.GetLocalInfoProvider <T>().BranchNames[GetMonthTerrestrialIndex(month)]);
}
public static string GetMonthCelestialStemName(int year, int month)
{
if (month < 1 || month > ILocalInfoProvider.GetLocalInfoProvider <T>().MonthNames.Length)
{
return("undefined");
}
return(ILocalInfoProvider.GetLocalInfoProvider <T>().StemNames[GetMonthCelestialStemIndex(year, month)]);
}
public static LuniSolarDate <T> LuniSolarDateFromSolarDate(int year, int month, int day)
{
float timeZone = ILocalInfoProvider.GetLocalInfoProvider <T>().TimeZone;
if (DateCacheSize > 0)
{
// init dictionary for the first time
if (_dateCache == null)
{
_dateCache = new Dictionary <string, LuniSolarDate <T> >(DateCacheSize);
}
// hash the year and time zone
string key = GetSolarDateHash(year, month, day, timeZone);
// if year is already cached, just take it out
if (_dateCache.ContainsKey(key))
{
return(_dateCache[key]);
}
// else, calculate the date and add cache to dictionay
else
{
// if dictionary is already full, remove the oldest pair.
if (_dateCache.Count == DateCacheSize)
{
_dateCache.Remove(_dateCache.Keys.First());
}
// calculate the date
var luniSolarDate = LuniSolarDate <T> .CalculateLuniSolarDateFromSolarDate(year, month, day);
// do not forget to add new date to dictionay :))
_dateCache.Add(key, luniSolarDate);
return(luniSolarDate);
}
}
// no caching, just calculate the date directly
else
{
return(LuniSolarDate <T> .CalculateLuniSolarDateFromSolarDate(year, month, day));
}
}
public static LuniSolarYear <T> GetLunarYear(int year)
{
float timeZone = ILocalInfoProvider.GetLocalInfoProvider <T>().TimeZone;
if (YearCacheSize > 0)
{
// init dictionary for the first time
if (_yearCache == null)
{
_yearCache = new Dictionary <string, LuniSolarYear <T> >();
}
// hash the year and time zone
string key = GetYearHash(year, timeZone);
// if year is already cached, just take it out
if (_yearCache.ContainsKey(key))
{
return(_yearCache[key]);
}
// else, calculate the year and add cache to dictionay
else
{
// if dictionary is already full, remove the oldest pair.
if (_yearCache.Count == YearCacheSize)
{
_yearCache.Remove(_yearCache.Keys.First());
}
// calculate the year
var lunarYear = new LuniSolarYear <T>(year);
// do not forget to add new year to dictionay :))
_yearCache.Add(key, lunarYear);
return(lunarYear);
}
}
// no caching, just calculate the year directly
else
{
return(new LuniSolarYear <T>(year));
}
}
public static string GetYearTerrestrialBranchName(int year) => ILocalInfoProvider.GetLocalInfoProvider <T>().BranchNames[GetYearTerrestrialBranchIndex(year)];
public static string GetYearCelestialStemName(int year) => ILocalInfoProvider.GetLocalInfoProvider <T>().StemNames[GetYearCelestialStemIndex(year)];
public static int GetSolarTermIndex(DateTime date) => Sun.GetSolarTermIndex(date.AddHours(-ILocalInfoProvider.GetLocalInfoProvider <T>().TimeZone).AddHours(24));
public static string GetDayTerrestrialBranchName(int solarYear, int solarMonth, int solarDay) => ILocalInfoProvider.GetLocalInfoProvider <T>().BranchNames[GetDayTerrestrialIndex(solarYear, solarMonth, solarDay)];
public static string GetDayCelestialStemName(int solarYear, int solarMonth, int solarDay) => ILocalInfoProvider.GetLocalInfoProvider <T>().StemNames[GetDayCelestialStemIndex(solarYear, solarMonth, solarDay)];
///// <summary>
///// 0 -> 12, 1 -> 1, 2 -> 2, 3 -> 3... 11 -> 11
///// </summary>
///// <param name="monthIndex"></param>
///// <returns></returns>
//public static int GetMonth(int monthIndex) { return monthIndex == 0 ? 12 : monthIndex; }
#endregion
#region Day
public static string GetSolarTermName(DateTime date)
{
return(ILocalInfoProvider.GetLocalInfoProvider <T>().SolarTerms[GetSolarTermIndex(date)]);
}
internal static LuniSolarDate <T> CalculateLuniSolarDateFromSolarDate(int year, int month, int day)
{
// Sample case 1: Solar date 24/05/2000 --- Lunar date 21/04/2000
// previousNewMoon = 04/05/2000
// lunarYear = previousNewMoon.Year = 2000
// newMoon11Before = 08/12/1999
// newMoon11After = 26/11/2000
// (04/05/2000 - 08/12/1999) / 29 = 148 days / 29
// = 5.10x
// --------------------------------------------------------------
// Sample case 2: Solar date 01/01/2014 --- Lunar date 01/12/2013
// previousNewMoon = 01/01/2014
// previousNewMoon.Year = 2014
// lunarYear = 2013
// newMoon11Before = 03/12/2013
// newMoon11After = 26/11/2000
// (01/01/2014 - 03/12/2013) / 29 = 29 days / 29
// = 1
// --------------------------------------------------------------
// Sample case 3: Solar date 22/12/2033 --- Lunar date 01/11i/2033
// previousNewMoon = 22/12/2033
// lunarYear = previousNewMoon.Year = 2033
// newMoon11Before = 03/12/2032
// newMoon11After = 22/11/2033
var timeZone = ILocalInfoProvider.GetLocalInfoProvider <T>().TimeZone;
int lunarYear;
int lunarMonth;
int lunarDay;
bool isLeapMonth = false;
var thisDay = new DateTime(year, month, day);
var k = (int)((thisDay.AddHours(-timeZone).UniversalDateTimeToJulianDate() - 2415021.076998695) / Constants.SynodicMonth + 0.5);
var previousNewMoon =
JulianDateConverter.JulianDateToUniversalDateTime(Moon.GetNewMoon(k)).AddHours(timeZone).Date;
while (previousNewMoon > thisDay)
{
previousNewMoon =
JulianDateConverter.JulianDateToUniversalDateTime(Moon.GetNewMoon(--k)).AddHours(timeZone).Date;
}
// "previous, this/current" and "next" are not used to avoid ambiguity.
var newMoon11Before = Moon.GetNewMoon11(previousNewMoon.Year - 1, timeZone).Date;
var newMoon11After = Moon.GetNewMoon11(previousNewMoon.Year, timeZone).Date;
// correcting for such cases as case 3
if (newMoon11After < previousNewMoon)
{
newMoon11Before = newMoon11After;
newMoon11After = Moon.GetNewMoon11(previousNewMoon.Year + 1, timeZone).Date;
}
var isLeapYear = (newMoon11After - newMoon11Before).TotalDays > 365.0;
var monthsFromNewMoon11Before = (int)((previousNewMoon - newMoon11Before).TotalDays / 29);
/* Note:
* monthsFromNewMoon11Before = 0: lunar month = 11, lunar year = previous year
* monthsFromNewMoon11Before = 1: lunar month = 12, lunar year = previous year
* monthsFromNewMoon11Before = 2: lunar month = 1, lunar year = this year
* monthsFromNewMoon11Before = 3: lunar month = 2, lunar year = this year
* and so on
*/
// month 11 and 12 belong to lunar year of the previous year.
if (monthsFromNewMoon11Before < 2)
{
lunarYear = newMoon11After.Year - 1;
lunarMonth = 11 + monthsFromNewMoon11Before;
}
else
{
lunarYear = newMoon11After.Year;
lunarMonth = monthsFromNewMoon11Before - 1;
}
// correcting month number if this lunar year is leap year
if (isLeapYear)
{
var leapMonthIndex = LuniSolarCalendar <VietnameseLocalInfoProvider> .GetLunarYear(newMoon11After.Year).LeapMonthIndex;
if (monthsFromNewMoon11Before >= leapMonthIndex)
{
lunarMonth--;
if (monthsFromNewMoon11Before == leapMonthIndex)
{
isLeapMonth = true;
}
}
}
lunarDay = (int)(thisDay - previousNewMoon).TotalDays + 1;
return(new LuniSolarDate <T>(lunarYear, lunarMonth, isLeapMonth, lunarDay, thisDay));
}
