我找到了一个将公历日期转换为 Jalali 日期的类
JDF.java
public class JDF {
/**
* Main: The default constructor uses the current Gregorian date to
* initialize the other private memebers of the class (Iranian and Julian
* dates).
*/
public JDF() {
Calendar calendar = new GregorianCalendar();
setGregorianDate(calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH) + 1,
calendar.get(Calendar.DAY_OF_MONTH));
}
public JDF(GregorianCalendar calendar) {
setGregorianDate(calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH) + 1,
calendar.get(Calendar.DAY_OF_MONTH));
}
public JDF(Calendar calendar) {
setGregorianDate(calendar.get(Calendar.YEAR),
calendar.get(Calendar.MONTH) + 1,
calendar.get(Calendar.DAY_OF_MONTH));
}
/**
* Main: This constructor receives a Gregorian date and initializes the
* other private members of the class accordingly.
*
* @param year int
* @param month int
* @param day int
* @return
*/
public JDF(int year, int month, int day) {
setGregorianDate(year, month, day);
}
/**
* getIranianYear: Returns the 'year' part of the Iranian date.
*
* @return int
*/
public int getIranianYear() {
return irYear;
}
/**
* getIranianMonth: Returns the 'month' part of the Iranian date.
*
* @return int
*/
public int getIranianMonth() {
return irMonth;
}
/**
* getGregorianCalendar: gets Iranian date and returns Gregorian calendar
*
* @return calendar
*/
public GregorianCalendar getGregorianCalendar(int year, int month, int day)
throws ParseException {
setIranianDate(year, month, day);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/M/d",
Locale.US);
Date myDate = dateFormat.parse(getGregorianDate());
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(myDate);
calendar.add(Calendar.MONTH, 1);
return calendar;
}
/**
* getIranianDayName: Returns the number of Iranian day of week
*
* @return int
*/
public int getIranianDay(int year, int month, int day)
throws ParseException {
setIranianDate(year, month, day);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy/M/d",
Locale.US);
Date myDate = dateFormat.parse(getGregorianDate());
Calendar calendar = Calendar.getInstance();
calendar.setTime(myDate);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
if (Calendar.SATURDAY == dayOfWeek) {
dayOfWeek = 0;
} else if (Calendar.SUNDAY == dayOfWeek) {
dayOfWeek = 1;
} else if (Calendar.MONDAY == dayOfWeek) {
dayOfWeek = 2;
} else if (Calendar.TUESDAY == dayOfWeek) {
dayOfWeek = 3;
} else if (Calendar.WEDNESDAY == dayOfWeek) {
dayOfWeek = 4;
} else if (Calendar.THURSDAY == dayOfWeek) {
dayOfWeek = 5;
} else if (Calendar.FRIDAY == dayOfWeek) {
dayOfWeek = 6;
}
return dayOfWeek;
}
/**
* getIranianDay: Returns the 'day' part of the Iranian date.
*
* @return int
*/
public int getIranianDay() {
return irDay;
}
/**
* getGregorianYear: Returns the 'year' part of the Gregorian date.
*
* @return int
*/
public int getGregorianYear() {
return gYear;
}
/**
* getGregorianMonth: Returns the 'month' part of the Gregorian date.
*
* @return int
*/
public int getGregorianMonth() {
return gMonth;
}
/**
* getGregorianDay: Returns the 'day' part of the Gregorian date.
*
* @return int
*/
public int getGregorianDay() {
return gDay;
}
/**
* getJulianYear: Returns the 'year' part of the Julian date.
*
* @return int
*/
public int getJulianYear() {
return juYear;
}
/**
* getJulianMonth: Returns the 'month' part of the Julian date.
*
* @return int
*/
public int getJulianMonth() {
return juMonth;
}
/**
* getJulianDay() Returns the 'day' part of the Julian date.
*
* @return int
*/
public int getJulianDay() {
return juDay;
}
/**
* getIranianDate: Returns a string version of Iranian date
*
* @return String
*/
public String getIranianDate() {
return (irYear + "/" + irMonth + "/" + irDay);
}
/**
* getGregorianDate: Returns a string version of Gregorian date
*
* @return String
*/
public String getGregorianDate() {
return (gYear + "/" + gMonth + "/" + gDay);
}
/**
* getJulianDate: Returns a string version of Julian date
*
* @return String
*/
public String getJulianDate() {
return (juYear + "/" + juMonth + "/" + juDay);
}
/**
* getWeekDayStr: Returns the week day name.
*
* @return String
*/
public String getWeekDayStr() {
String weekDayStr[] = {"Monday", "Tuesday", "Wednesday", "Thursday",
"Friday", "Saturday", "Sunday"};
return (weekDayStr[getDayOfWeek()]);
}
/**
* toString: Overrides the default toString() method to return all dates.
*
* @return String
*/
@Override
public String toString() {
return (getWeekDayStr() + ", Gregorian:[" + getGregorianDate()
+ "], Julian:[" + getJulianDate() + "], Iranian:["
+ getIranianDate() + "]");
}
/**
* getDayOfWeek: Returns the week day number. Monday=0..Sunday=6;
*
* @return int
*/
public int getDayOfWeek() {
return (JDN % 7);
}
/**
* nextDay: Go to next julian day number (JDN) and adjusts the other dates.
*/
public void nextDay() {
JDN++;
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* nextDay: Overload the nextDay() method to accept the number of days to go
* ahead and adjusts the other dates accordingly.
*
* @param days int
*/
public void nextDay(int days) {
JDN += days;
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* previousDay: Go to previous julian day number (JDN) and adjusts the otehr
* dates.
*/
public void previousDay() {
JDN--;
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* previousDay: Overload the previousDay() method to accept the number of
* days to go backward and adjusts the other dates accordingly.
*
* @param days int
*/
public void previousDay(int days) {
JDN -= days;
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* setIranianDate: Sets the date according to the Iranian calendar and
* adjusts the other dates.
*
* @param year int
* @param month int
* @param day int
*/
public void setIranianDate(int year, int month, int day) {
irYear = year;
irMonth = month;
irDay = day;
JDN = IranianDateToJDN();
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* setGregorianDate: Sets the date according to the Gregorian calendar and
* adjusts the other dates.
*
* @param year int
* @param month int
* @param day int
*/
public void setGregorianDate(int year, int month, int day) {
gYear = year;
gMonth = month;
gDay = day;
JDN = gregorianDateToJDN(year, month, day);
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* setJulianDate: Sets the date according to the Julian calendar and adjusts
* the other dates.
*
* @param year int
* @param month int
* @param day int
*/
public void setJulianDate(int year, int month, int day) {
juYear = year;
juMonth = month;
juDay = day;
JDN = julianDateToJDN(year, month, day);
JDNToIranian();
JDNToJulian();
JDNToGregorian();
}
/**
* IranianCalendar: This method determines if the Iranian (Jalali) year is
* leap (366-day long) or is the common year (365 days), and finds the day
* in March (Gregorian Calendar)of the first day of the Iranian year
* ('irYear').Iranian year (irYear) ranges from (-61 to 3177).This method
* will set the following private data members as follows: leap: Number of
* years since the last leap year (0 to 4) Gy: Gregorian year of the
* begining of Iranian year march: The March day of Farvardin the 1st (first
* day of jaYear)
*/
private void IranianCalendar() {
// Iranian years starting the 33-year rule
int Breaks[] = {-61, 9, 38, 199, 426, 686, 756, 818, 1111, 1181, 1210,
1635, 2060, 2097, 2192, 2262, 2324, 2394, 2456, 3178};
int jm, N, leapJ, leapG, jp, j, jump;
gYear = irYear + 621;
leapJ = -14;
jp = Breaks[0];
// Find the limiting years for the Iranian year 'irYear'
j = 1;
do {
jm = Breaks[j];
jump = jm - jp;
if (irYear >= jm) {
leapJ += (jump / 33 * 8 + (jump % 33) / 4);
jp = jm;
}
j++;
} while ((j < 20) && (irYear >= jm));
N = irYear - jp;
// Find the number of leap years from AD 621 to the begining of the
// current
// Iranian year in the Iranian (Jalali) calendar
leapJ += (N / 33 * 8 + ((N % 33) + 3) / 4);
if (((jump % 33) == 4) && ((jump - N) == 4))
leapJ++;
// And the same in the Gregorian date of Farvardin the first
leapG = gYear / 4 - ((gYear / 100 + 1) * 3 / 4) - 150;
march = 20 + leapJ - leapG;
// Find how many years have passed since the last leap year
if ((jump - N) < 6)
N = N - jump + ((jump + 4) / 33 * 33);
leap = (((N + 1) % 33) - 1) % 4;
if (leap == -1)
leap = 4;
}
/**
* IranianDateToJDN: Converts a date of the Iranian calendar to the Julian
* Day Number. It first invokes the 'IranianCalender' private method to
* convert the Iranian date to Gregorian date and then returns the Julian
* Day Number based on the Gregorian date. The Iranian date is obtained from
* 'irYear'(1-3100),'irMonth'(1-12) and 'irDay'(1-29/31).
*
* @return long (Julian Day Number)
*/
private int IranianDateToJDN() {
IranianCalendar();
return (gregorianDateToJDN(gYear, 3, march) + (irMonth - 1) * 31
- irMonth / 7 * (irMonth - 7) + irDay - 1);
}
/**
* JDNToIranian: Converts the current value of 'JDN' Julian Day Number to a
* date in the Iranian calendar. The caller should make sure that the
* current value of 'JDN' is set correctly. This method first converts the
* JDN to Gregorian calendar and then to Iranian calendar.
*/
private void JDNToIranian() {
JDNToGregorian();
irYear = gYear - 621;
IranianCalendar(); // This invocation will update 'leap' and 'march'
int JDN1F = gregorianDateToJDN(gYear, 3, march);
int k = JDN - JDN1F;
if (k >= 0) {
if (k <= 185) {
irMonth = 1 + k / 31;
irDay = (k % 31) + 1;
return;
} else
k -= 186;
} else {
irYear--;
k += 179;
if (leap == 1)
k++;
}
irMonth = 7 + k / 30;
irDay = (k % 30) + 1;
}
/**
* julianDateToJDN: Calculates the julian day number (JDN) from Julian
* calendar dates. This integer number corresponds to the noon of the date
* (i.e. 12 hours of Universal Time). This method was tested to be good
* (valid) since 1 March, -100100 (of both calendars) up to a few millions
* (10^6) years into the future. The algorithm is based on D.A.Hatcher,
* Q.Jl.R.Astron.Soc. 25(1984), 53-55 slightly modified by K.M. Borkowski,
* Post.Astron. 25(1987), 275-279.
*
* @param year int
* @param month int
* @param day int
* @return int
*/
private int julianDateToJDN(int year, int month, int day) {
return (year + (month - 8) / 6 + 100100) * 1461 / 4
+ (153 * ((month + 9) % 12) + 2) / 5 + day - 34840408;
}
/**
* JDNToJulian: Calculates Julian calendar dates from the julian day number
* (JDN) for the period since JDN=-34839655 (i.e. the year -100100 of both
* calendars) to some millions (10^6) years ahead of the present. The
* algorithm is based on D.A. Hatcher, Q.Jl.R.Astron.Soc. 25(1984), 53-55
* slightly modified by K.M. Borkowski, Post.Astron. 25(1987), 275-279).
*/
private void JDNToJulian() {
int j = 4 * JDN + 139361631;
int i = ((j % 1461) / 4) * 5 + 308;
juDay = (i % 153) / 5 + 1;
juMonth = ((i / 153) % 12) + 1;
juYear = j / 1461 - 100100 + (8 - juMonth) / 6;
}
/**
* gergorianDateToJDN: Calculates the julian day number (JDN) from Gregorian
* calendar dates. This integer number corresponds to the noon of the date
* (i.e. 12 hours of Universal Time). This method was tested to be good
* (valid) since 1 March, -100100 (of both calendars) up to a few millions
* (10^6) years into the future. The algorithm is based on D.A.Hatcher,
* Q.Jl.R.Astron.Soc. 25(1984), 53-55 slightly modified by K.M. Borkowski,
* Post.Astron. 25(1987), 275-279.
*
* @param year int
* @param month int
* @param day int
* @return int
*/
private int gregorianDateToJDN(int year, int month, int day) {
int jdn = (year + (month - 8) / 6 + 100100) * 1461 / 4
+ (153 * ((month + 9) % 12) + 2) / 5 + day - 34840408;
jdn = jdn - (year + 100100 + (month - 8) / 6) / 100 * 3 / 4 + 752;
return (jdn);
}
public static boolean isLeapYear(int year) {
double a = 0.025;
int b = 266;
double leapDays0;
double leapDays1;
if (year > 0) {
leapDays0 = ((year + 38) % 2820) * 0.24219 + a;
leapDays1 = ((year + 39) % 2820) * 0.24219 + a;
} else if (year < 0) {
leapDays0 = ((year + 39) % 2820) * 0.24219 + a;
leapDays1 = ((year + 40) % 2820) * 0.24219 + a;
} else
return false;
int frac0 = (int) ((leapDays0 - (int) (leapDays0)) * 1000);
int frac1 = (int) ((leapDays1 - (int) (leapDays1)) * 1000);
return frac0 <= b && frac1 > b;
}
/**
* JDNToGregorian: Calculates Gregorian calendar dates from the julian day
* number (JDN) for the period since JDN=-34839655 (i.e. the year -100100 of
* both calendars) to some millions (10^6) years ahead of the present. The
* algorithm is based on D.A. Hatcher, Q.Jl.R.Astron.Soc. 25(1984), 53-55
* slightly modified by K.M. Borkowski, Post.Astron. 25(1987), 275-279).
*/
private void JDNToGregorian() {
int j = 4 * JDN + 139361631;
j = j + (((((4 * JDN + 183187720) / 146097) * 3) / 4) * 4 - 3908);
int i = ((j % 1461) / 4) * 5 + 308;
gDay = (i % 153) / 5 + 1;
gMonth = ((i / 153) % 12) + 1;
gYear = j / 1461 - 100100 + (8 - gMonth) / 6;
}
private int irYear; // Year part of a Iranian date
private int irMonth; // Month part of a Iranian date
private int irDay; // Day part of a Iranian date
private int gYear; // Year part of a Gregorian date
private int gMonth; // Month part of a Gregorian date
private int gDay; // Day part of a Gregorian date
private int juYear; // Year part of a Julian date
private int juMonth; // Month part of a Julian date
private int juDay; // Day part of a Julian date
private int leap; // Number of years since the last leap year (0 to 4)
private int JDN; // Julian Day Number
private int march; // The march day of Farvardin the first (First day of
// jaYear)
}
但我不能使用这个类，例如我想显示 jalali 字符串日期喜欢：پنجشنبه، ۱۴ تیر ۱۳۹۷
不幸的是，源站点没有完全解释，如果有人在波斯站点上被指示过这个类，请提交站点链接