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

Question

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?

Answer 1

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);     } }