问题
Is there any way or library in Android to convert Gregorian date to Hijri(Islamic) one? I found some Java libraries such as Joda Time but I need something which works in Android.
回答1:
I found this but I didn't test it yet
public class DateHijri {
static double gmod(double n, double m) {
return ((n % m) + m) % m;
}
static double[] kuwaiticalendar(boolean adjust) {
Calendar today = Calendar.getInstance();
int adj = 0;
if (adjust) {
adj = 0;
} else {
adj = 1;
}
if (adjust) {
int adjustmili = 1000 * 60 * 60 * 24 * adj;
long todaymili = today.getTimeInMillis() + adjustmili;
today.setTimeInMillis(todaymili);
}
double day = today.get(Calendar.DAY_OF_MONTH);
double month = today.get(Calendar.MONTH);
double year = today.get(Calendar.YEAR);
double m = month + 1;
double y = year;
if (m < 3) {
y -= 1;
m += 12;
}
double a = Math.floor(y / 100.);
double b = 2 - a + Math.floor(a / 4.);
if (y < 1583)
b = 0;
if (y == 1582) {
if (m > 10)
b = -10;
if (m == 10) {
b = 0;
if (day > 4)
b = -10;
}
}
double jd = Math.floor(365.25 * (y + 4716))
+ Math.floor(30.6001 * (m + 1)) + day + b - 1524;
b = 0;
if (jd > 2299160) {
a = Math.floor((jd - 1867216.25) / 36524.25);
b = 1 + a - Math.floor(a / 4.);
}
double bb = jd + b + 1524;
double cc = Math.floor((bb - 122.1) / 365.25);
double dd = Math.floor(365.25 * cc);
double ee = Math.floor((bb - dd) / 30.6001);
day = (bb - dd) - Math.floor(30.6001 * ee);
month = ee - 1;
if (ee > 13) {
cc += 1;
month = ee - 13;
}
year = cc - 4716;
double wd = gmod(jd + 1, 7) + 1;
double iyear = 10631. / 30.;
double epochastro = 1948084;
double epochcivil = 1948085;
double shift1 = 8.01 / 60.;
double z = jd - epochastro;
double cyc = Math.floor(z / 10631.);
z = z - 10631 * cyc;
double j = Math.floor((z - shift1) / iyear);
double iy = 30 * cyc + j;
z = z - Math.floor(j * iyear + shift1);
double im = Math.floor((z + 28.5001) / 29.5);
if (im == 13)
im = 12;
double id = z - Math.floor(29.5001 * im - 29);
double[] myRes = new double[8];
myRes[0] = day; // calculated day (CE)
myRes[1] = month - 1; // calculated month (CE)
myRes[2] = year; // calculated year (CE)
myRes[3] = jd - 1; // julian day number
myRes[4] = wd - 1; // weekday number
myRes[5] = id; // islamic date
myRes[6] = im - 1; // islamic month
myRes[7] = iy; // islamic year
return myRes;
}
static String writeIslamicDate() {
String[] wdNames = { "Ahad", "Ithnin", "Thulatha", "Arbaa", "Khams",
"Jumuah", "Sabt" };
String[] iMonthNames = { "Muharram", "Safar", "Rabi'ul Awwal",
"Rabi'ul Akhir", "Jumadal Ula", "Jumadal Akhira", "Rajab",
"Sha'ban", "Ramadan", "Shawwal", "Dhul Qa'ada", "Dhul Hijja" };
// This Value is used to give the correct day +- 1 day
boolean dayTest = true;
double[] iDate = kuwaiticalendar(dayTest);
String outputIslamicDate = wdNames[(int) iDate[4]] + ", " + iDate[5]
+ " " + iMonthNames[(int) iDate[6]] + " " + iDate[7] + " AH";
return outputIslamicDate;
}
}
回答2:
You can use this Class in your Project (Hope it helps) :
import java.text.SimpleDateFormat;
import java.util.Date;
public class PersianDate {
public String todayShamsi()
{
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String curentDateandTime = sdf.format(new Date());
String year = curentDateandTime.substring(0, 4);
String month = curentDateandTime.substring(4, 6);
String day = curentDateandTime.substring(6, 8);
int Y = Integer.valueOf(year);
int M = Integer.valueOf(month);
int D = Integer.valueOf(day);
return Shamsi(Y, M, D);
}
public static String Shamsi(int Y, int M, int D)
{
if (Y == 0)
Y = 2000;
if (Y < 100)
Y = Y + 1900;
if (Y == 2000)
{
if (M > 2)
{
SimpleDateFormat temp = new SimpleDateFormat("yyyyMMdd");
String curentDateandTime = temp.format(new Date());
String year = curentDateandTime.substring(0, 4);
String month = curentDateandTime.substring(4, 6);
String day = curentDateandTime.substring(6, 8);
Y = Integer.valueOf(year);
M = Integer.valueOf(month);
D = Integer.valueOf(day);
}
}
if (M < 3 || (M == 3 && D < 21))
{
Y -= 622;
}
else Y -= 621;
switch (M)
{
case 1: if (D < 21)
{
M = 10;
D = D + 10;
}
else
{
M = 11;
D -= 20;
}
break;
case 2: if (D < 20)
{
M = 11;
D = D + 11;
}
else
{
M = 12;
D -= 19;
}
break;
case 3:
if (D < 21)
{
M = 12;
D = D + 9;
}
else
{
M = 1;
D -= 20;
}
break;
case 4:
if (D < 21)
{
M = 1;
D = D + 11;
}
else
{
M = 2; D = D - 20;
}
break;
case 5:
if (D < 22)
{
M = M - 3;
D = D + 10;
}
else
{
M = M - 2;
D = D - 21;
}
break;
case 6:
if (D < 22)
{
M = M - 3;
D = D + 10;
}
else
{
M = M - 2;
D = D - 21;
}
break;
case 7:
if (D < 23)
{
M = M - 3;
D = D + 9;
}
else
{
M = M - 2;
D = D - 22;
}
break;
case 8:
if (D < 23)
{
M = M - 3;
D = D + 9;
}
else
{
M = M - 2;
D = D - 22;
}
break;
case 9:
if (D < 23)
{
M = M - 3;
D = D + 9;
}
else
{
M = M - 2;
D = D - 22;
}
break;
case 10:
if (D < 23)
{
M = 7;
D = D + 8;
}
else
{
M = 8;
D = D - 22;
}
break;
case 11:
if (D < 22)
{
M = M - 3;
D = D + 9;
}
else
{
M = M - 2;
D = D - 21;
}
break;
case 12:
if (D < 22)
{
M = M - 3;
D = D + 9;
}
else
{
M = M - 2;
D = D - 21;
}
break;
}
String month = "00";
String day = "00";
//D = Integer.valueOf(D)+1;
if (M < 10)
{
month = "0" + M;
}
else
{
month = String.valueOf(M);
}
if (D < 10)
{
day = "0" + D;
}
else
{
day = String.valueOf(D);
}
return String.valueOf(Y) + "/" + month + "/" + day;
}
}
来源：https://stackoverflow.com/questions/17377219/gregorian-to-hijri-islamic-date