// Am lich sang Duong lich
public static int[] convertLunar2Solar(int lunarDay, int lunarMonth, int lunarYear, int lunarLeap, double timeZone)
{
int b11;
int a11;
if ((lunarMonth < 11))
{
a11 = VietCalendar.getLunarMonth11((lunarYear - 1), timeZone);
b11 = VietCalendar.getLunarMonth11(lunarYear, timeZone);
}
else
{
a11 = VietCalendar.getLunarMonth11(lunarYear, timeZone);
b11 = VietCalendar.getLunarMonth11((lunarYear + 1), timeZone);
}
int k = VietCalendar.INT((0.5
+ ((a11 - 2415021.0769986948)
/ 29.530588853)));
int off = (lunarMonth - 11);
if ((off < 0))
{
off += 12;
}
if (((b11 - a11)
> 365))
{
int leapOff = VietCalendar.getLeapMonthOffset(a11, timeZone);
int leapMonth = (leapOff - 2);
if ((leapMonth < 0))
{
leapMonth += 12;
}
if (((lunarLeap != 0) &&
(lunarMonth != leapMonth)))
{
// System.out.println("Invalid input!");
return(new int[] {
0,
0,
0
});
}
else if (((lunarLeap != 0) ||
(off >= leapOff)))
{
off++;
}
}
int monthStart = VietCalendar.getNewMoonDay((k + off), timeZone);
return(VietCalendar.jdToDate((monthStart
+ (lunarDay - 1))));
}
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);
}
public static int getLeapMonthOffset(int a11, double timeZone)
{
int k = VietCalendar.INT((0.5
+ ((a11 - 2415021.0769986948)
/ 29.530588853)));
int last;
// Month 11 contains point of sun longutide 3*PI/2 (December solstice)
int i = 1;
// We start with the month following lunar month 11
int arc = VietCalendar.INT((VietCalendar.getSunLongitude(VietCalendar.getNewMoonDay((k + i), timeZone), timeZone) / 30));
do
{
last = arc;
i++;
arc = VietCalendar.INT((VietCalendar.getSunLongitude(VietCalendar.getNewMoonDay((k + i), timeZone), timeZone) / 30));
} while (((arc != last) &&
(i < 14)));
return(i - 1);
}
// 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
});
}