javaandroidfarsijalali-calendar

Is there any library or algorithm for Persian (Shamsi or Jalali) calendar in Android?


I want to convert Gregorian (western) date to Persian (Shamsi) date and vice versa for all versions of Android.

Is there any complete and reliable library or algorithm?


Solution

  • I'm using this algorithm for years and it is very accurate between 1901 and 2099.

    Use it and Enjoy! :)

    public class Utilities {
    
        private class SolarCalendar {
    
            public String strWeekDay = "";
            public String strMonth = "";
    
            int date;
            int month;
            int year;
    
            public SolarCalendar()
            {
                Date MiladiDate = new Date();
                calcSolarCalendar(MiladiDate);
            }
    
            public SolarCalendar(Date MiladiDate)
            {
                calcSolarCalendar(MiladiDate);
            }
    
            private void calcSolarCalendar(Date MiladiDate) {
    
                int ld;
    
                int miladiYear = MiladiDate.getYear() + 1900;
                int miladiMonth = MiladiDate.getMonth() + 1;
                int miladiDate = MiladiDate.getDate();
                int WeekDay = MiladiDate.getDay();
    
                int[] buf1 = new int[12];
                int[] buf2 = new int[12];
    
                buf1[0] = 0;
                buf1[1] = 31;
                buf1[2] = 59;
                buf1[3] = 90;
                buf1[4] = 120;
                buf1[5] = 151;
                buf1[6] = 181;
                buf1[7] = 212;
                buf1[8] = 243;
                buf1[9] = 273;
                buf1[10] = 304;
                buf1[11] = 334;
    
                buf2[0] = 0;
                buf2[1] = 31;
                buf2[2] = 60;
                buf2[3] = 91;
                buf2[4] = 121;
                buf2[5] = 152;
                buf2[6] = 182;
                buf2[7] = 213;
                buf2[8] = 244;
                buf2[9] = 274;
                buf2[10] = 305;
                buf2[11] = 335;
    
                if ((miladiYear % 4) != 0) {
                    date = buf1[miladiMonth - 1] + miladiDate;
    
                    if (date > 79) {
                        date = date - 79;
                        if (date <= 186) {
                            switch (date % 31) {
                            case 0:
                                month = date / 31;
                                date = 31;
                                break;
                            default:
                                month = (date / 31) + 1;
                                date = (date % 31);
                                break;
                            }
                            year = miladiYear - 621;
                        } else {
                            date = date - 186;
    
                            switch (date % 30) {
                            case 0:
                                month = (date / 30) + 6;
                                date = 30;
                                break;
                            default:
                                month = (date / 30) + 7;
                                date = (date % 30);
                                break;
                            }
                            year = miladiYear - 621;
                        }
                    } else {
                        if ((miladiYear > 1996) && (miladiYear % 4) == 1) {
                            ld = 11;
                        } else {
                            ld = 10;
                        }
                        date = date + ld;
    
                        switch (date % 30) {
                        case 0:
                            month = (date / 30) + 9;
                            date = 30;
                            break;
                        default:
                            month = (date / 30) + 10;
                            date = (date % 30);
                            break;
                        }
                        year = miladiYear - 622;
                    }
                } else {
                    date = buf2[miladiMonth - 1] + miladiDate;
    
                    if (miladiYear >= 1996) {
                        ld = 79;
                    } else {
                        ld = 80;
                    }
                    if (date > ld) {
                        date = date - ld;
    
                        if (date <= 186) {
                            switch (date % 31) {
                            case 0:
                                month = (date / 31);
                                date = 31;
                                break;
                            default:
                                month = (date / 31) + 1;
                                date = (date % 31);
                                break;
                            }
                            year = miladiYear - 621;
                        } else {
                            date = date - 186;
    
                            switch (date % 30) {
                            case 0:
                                month = (date / 30) + 6;
                                date = 30;
                                break;
                            default:
                                month = (date / 30) + 7;
                                date = (date % 30);
                                break;
                            }
                            year = miladiYear - 621;
                        }
                    }
    
                    else {
                        date = date + 10;
    
                        switch (date % 30) {
                        case 0:
                            month = (date / 30) + 9;
                            date = 30;
                            break;
                        default:
                            month = (date / 30) + 10;
                            date = (date % 30);
                            break;
                        }
                        year = miladiYear - 622;
                    }
    
                }
    
                switch (month) {
                case 1:
                    strMonth = "فروردين";
                    break;
                case 2:
                    strMonth = "ارديبهشت";
                    break;
                case 3:
                    strMonth = "خرداد";
                    break;
                case 4:
                    strMonth = "تير";
                    break;
                case 5:
                    strMonth = "مرداد";
                    break;
                case 6:
                    strMonth = "شهريور";
                    break;
                case 7:
                    strMonth = "مهر";
                    break;
                case 8:
                    strMonth = "آبان";
                    break;
                case 9:
                    strMonth = "آذر";
                    break;
                case 10:
                    strMonth = "دي";
                    break;
                case 11:
                    strMonth = "بهمن";
                    break;
                case 12:
                    strMonth = "اسفند";
                    break;
                }
    
                switch (WeekDay) {
    
                case 0:
                    strWeekDay = "يکشنبه";
                    break;
                case 1:
                    strWeekDay = "دوشنبه";
                    break;
                case 2:
                    strWeekDay = "سه شنبه";
                    break;
                case 3:
                    strWeekDay = "چهارشنبه";
                    break;
                case 4:
                    strWeekDay = "پنج شنبه";
                    break;
                case 5:
                    strWeekDay = "جمعه";
                    break;
                case 6:
                    strWeekDay = "شنبه";
                    break;
                }
    
            }
    
        }
    
        public static String getCurrentShamsidate() {
            Locale loc = new Locale("en_US");
            Utilities util = new Utilities();
            SolarCalendar sc = util.new SolarCalendar();
            return String.valueOf(sc.year) + "/" + String.format(loc, "%02d",
                    sc.month) + "/" + String.format(loc, "%02d", sc.date);
        }
    }