public static int getLunarMonth11(int yy, double timeZone)
{
double off = (VietCalendar.jdFromDate(31, 12, yy) - 2415021.0769986948);
int k = VietCalendar.INT((off / 29.530588853));
int nm = VietCalendar.getNewMoonDay(k, timeZone);
int sunLong = VietCalendar.INT((VietCalendar.getSunLongitude(nm, timeZone) / 30));
if ((sunLong >= 9))
{
nm = VietCalendar.getNewMoonDay((k - 1), timeZone);
}
return(nm);
}
// Duong lich sang Am lich
public static int[] convertSolar2Lunar(int dd, int mm, int yy, double timeZone)
{
int lunarLeap;
int lunarDay;
int lunarMonth;
int lunarYear;
int dayNumber = VietCalendar.jdFromDate(dd, mm, yy);
int k = VietCalendar.INT(((dayNumber - 2415021.0769986948)
/ 29.530588853));
int monthStart = VietCalendar.getNewMoonDay((k + 1), timeZone);
if ((monthStart > dayNumber))
{
monthStart = VietCalendar.getNewMoonDay(k, timeZone);
}
int a11 = VietCalendar.getLunarMonth11(yy, timeZone);
int b11 = a11;
if ((a11 >= monthStart))
{
lunarYear = yy;
a11 = VietCalendar.getLunarMonth11((yy - 1), timeZone);
}
else
{
lunarYear = (yy + 1);
b11 = VietCalendar.getLunarMonth11((yy + 1), timeZone);
}
lunarDay = ((dayNumber - monthStart)
+ 1);
int diff = VietCalendar.INT(((monthStart - a11)
/ 29));
lunarLeap = 0;
lunarMonth = (diff + 11);
if (((b11 - a11)
> 365))
{
int leapMonthDiff = VietCalendar.getLeapMonthOffset(a11, timeZone);
if ((diff >= leapMonthDiff))
{
lunarMonth = (diff + 10);
if ((diff == leapMonthDiff))
{
lunarLeap = 1;
}
}
}
if ((lunarMonth > 12))
{
lunarMonth = (lunarMonth - 12);
}
if (((lunarMonth >= 11) &&
(diff < 4)))
{
lunarYear--;
}
return(new int[] {
lunarDay,
lunarMonth,
lunarYear,
lunarLeap
});
}
