using System;
using System.Globalization;
using System.Reflection;

namespace System 
{
    public static class PersianDateExtensionMethods
    {
        private static CultureInfo _Culture;
        public static CultureInfo GetPersianCulture()
        {
            if (_Culture == null)
            {
                _Culture = new CultureInfo("fa-IR");
                DateTimeFormatInfo formatInfo = _Culture.DateTimeFormat;
                formatInfo.AbbreviatedDayNames = new[] { "ی", "د", "س", "چ", "پ", "ج", "ش" };
                formatInfo.DayNames = new[] { "یکشنبه", "دوشنبه", "سه شنبه", "چهار شنبه", "پنجشنبه", "جمعه", "شنبه" };
                var monthNames = new[]
                {
                    "فروردین", "اردیبهشت", "خرداد", "تیر", "مرداد", "شهریور", "مهر", "آبان", "آذر", "دی", "بهمن",
                    "اسفند",
                    ""
                };
                formatInfo.AbbreviatedMonthNames =
                    formatInfo.MonthNames =
                    formatInfo.MonthGenitiveNames = formatInfo.AbbreviatedMonthGenitiveNames = monthNames;
                formatInfo.AMDesignator = "ق.ظ";
                formatInfo.PMDesignator = "ب.ظ";
                formatInfo.ShortDatePattern = "yyyy/MM/dd";
                formatInfo.LongDatePattern = "dddd, dd MMMM,yyyy";
                formatInfo.FirstDayOfWeek = DayOfWeek.Saturday;
                System.Globalization.Calendar cal = new PersianCalendar();

                FieldInfo fieldInfo = _Culture.GetType().GetField("calendar", BindingFlags.NonPublic | BindingFlags.Instance);
                if (fieldInfo != null)
                    fieldInfo.SetValue(_Culture, cal);

                FieldInfo info = formatInfo.GetType().GetField("calendar", BindingFlags.NonPublic | BindingFlags.Instance);
                if (info != null)
                    info.SetValue(formatInfo, cal);

                _Culture.NumberFormat.NumberDecimalSeparator = "/";
                _Culture.NumberFormat.DigitSubstitution = DigitShapes.NativeNational;
                _Culture.NumberFormat.NumberNegativePattern = 0;
            }
            return _Culture;
        }

        public static string ToPeString(this DateTime date,string format = "yyyy/MM/dd")
        {
            return date.ToString(format,GetPersianCulture());
        }
    }
}

var date1 = DateTime.Now.ToPeString("yyyy/MM/dd");
var date2 = DateTime.Now.ToPeString("dddd, dd MMMM,yyyy");

//Output:
//1391/12/13
//یکشنبه, 13 اسفند,1391

mklink /j C:\android-sdk "C:\Program Files (x86)\Android\android-sdk"

 <AotAssemblies>true</AotAssemblies> 
 <EnableLLVM>true</EnableLLVM>