public static LunarDate SolarToLunar(DateTime date, int timeZone)
{
long k, dayNumber, monthStart, a11, b11, lunarDay, lunarMonth, lunarYear, diff, leapMonthDiff;
bool lunarLeap;
dayNumber = UtilityDate.jdFromDate(date.Day, date.Month, date.Year);
k = UtilityDate.INT((dayNumber - 2415021.076998695) / 29.530588853);
monthStart = UtilityDate.getNewMoonDay(k + 1, timeZone);
if (monthStart > dayNumber)
{
monthStart = UtilityDate.getNewMoonDay(k, timeZone);
}
// alert(dayNumber+" -> "+monthStart);
a11 = UtilityDate.getLunarMonth11(date.Year, timeZone);
b11 = a11;
if (a11 >= monthStart)
{
lunarYear = date.Year;
a11 = UtilityDate.getLunarMonth11(date.Year - 1, timeZone);
}
else
{
lunarYear = date.Year + 1;
b11 = UtilityDate.getLunarMonth11(date.Year + 1, timeZone);
}
lunarDay = dayNumber - monthStart + 1;
diff = UtilityDate.INT((monthStart - a11) / 29);
lunarLeap = false;
lunarMonth = diff + 11;
if (b11 - a11 > 365)
{
leapMonthDiff = UtilityDate.getLeapMonthOffset(a11, timeZone);
if (diff >= leapMonthDiff)
{
lunarMonth = diff + 10;
if (diff == leapMonthDiff)
{
lunarLeap = true;
}
}
}
if (lunarMonth > 12)
{
lunarMonth = lunarMonth - 12;
}
if (lunarMonth >= 11 && diff < 4)
{
lunarYear -= 1;
}
return(new LunarDate((int)lunarDay, (int)lunarMonth, (int)lunarYear, lunarLeap));
}
public static DateTime LunarToSolar(LunarDate ld, int timeZone)
{
long k, a11, b11, off, leapOff, leapMonth, monthStart;
if (ld.Month < 11)
{
a11 = UtilityDate.getLunarMonth11(ld.Year - 1, timeZone);
b11 = UtilityDate.getLunarMonth11(ld.Year, timeZone);
}
else
{
a11 = UtilityDate.getLunarMonth11(ld.Year, timeZone);
b11 = UtilityDate.getLunarMonth11(ld.Year + 1, timeZone);
}
k = UtilityDate.INT(0.5 + (a11 - 2415021.076998695) / 29.530588853);
off = ld.Month - 11;
if (off < 0)
{
off += 12;
}
if (b11 - a11 > 365)
{
leapOff = UtilityDate.getLeapMonthOffset(a11, timeZone);
leapMonth = leapOff - 2;
if (leapMonth < 0)
{
leapMonth += 12;
}
if (ld.IsLeapYear && ld.Month != leapMonth)
{
return(DateTime.MinValue);
}
else if (ld.IsLeapYear || off >= leapOff)
{
off += 1;
}
}
monthStart = UtilityDate.getNewMoonDay(k + off, timeZone);
return(UtilityDate.jdToDate(monthStart + ld.Day - 1));
}