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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?
962
To enable the Persian calendar, go into Settings, click on the General tab, and select it as an Alternate calendar. The Persian calendar begins each year on the vernal equinox as determined by astronomical calculations and observations.
The Solar Hijri calendar is one of the oldest calendars in the world, as well as the most accurate solar calendar in use today. Since the calendar uses astronomical calculation for determining the vernal equinox, it has no intrinsic error.
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); } } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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