using System;

using System.Globalization;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        PersianCalendar pc = new PersianCalendar();     

        var current = DateTime.Now;

        DateTime dt = new DateTime(pc.GetYear(current), pc.GetMonth(current), 1, pc);

        Console.WriteLine(dt.ToString(CultureInfo.InvariantCulture));

        Console.WriteLine(DateTime.Now.ToString("yyyy-MM-dd"));

        var id = Guid.NewGuid().ToString().Replace("-","");

        var byteId = Encoding.UTF8.GetBytes(id);

        Console.WriteLine(UniqueIdGenerator.GenerateBase32(byteId));

    }   

}

​

public static class UniqueIdGenerator

    {

        private static readonly string _encode32Chars = "0123456789abcdefghjkmnpqrstvwxyz";

        private static readonly string _encode54Chars = "0123456789ABCDEFGHJKMNPQRSTVWXYZabcdefghjkmnpqrstvwxyz";

​

        public static string GenerateBase32()

        {

            var guid = Guid.NewGuid().ToByteArray();

​

            var hs = BitConverter.ToInt64(guid, 0);

            var ls = BitConverter.ToInt64(guid, 8);

​

            return ToBase32(hs, ls);

        }

        public static string GenerateBase32(byte[] input)

        {

            var hs = BitConverter.ToInt64(input, 0);

            var ls = BitConverter.ToInt64(input, 8);

​

            return ToBase32(hs, ls);

        }

​

        public static string GenerateInBase(char[] encodeChars)

        {

            var guid = Guid.NewGuid().ToByteArray();

​

            var hs = BitConverter.ToInt64(guid, 0);

            var ls = BitConverter.ToInt64(guid, 8);

​

            var hsStr = LongToString(hs, encodeChars);

            var lsStr = LongToString(ls, encodeChars);

            return hsStr + lsStr;

        }

        public static string GenerateBase54()

        {

            return GenerateInBase(_encode54Chars.ToCharArray());

        }

        private static string LongToString(long value, char[] baseChars)

        {

            var i = 64;

            var buffer = new char[i];

            var targetBase= baseChars.Length;

​

            do

            {

                buffer[--i] = baseChars[value % targetBase];

                value /= targetBase;

            }

            while (value > 0);

            var result = new char[64 - i];

            Array.Copy(buffer, i, result, 0, 64 - i);

            return new string(result);

        }

​

        private static string ToBase32(long hs, long ls)

        {

            var charBuffer = new char[26];

​

            charBuffer[0] = _encode32Chars[(int)(hs >> 60) & 31];

            charBuffer[1] = _encode32Chars[(int)(hs >> 55) & 31];

            charBuffer[2] = _encode32Chars[(int)(hs >> 50) & 31];

            charBuffer[3] = _encode32Chars[(int)(hs >> 45) & 31];

            charBuffer[4] = _encode32Chars[(int)(hs >> 40) & 31];

            charBuffer[5] = _encode32Chars[(int)(hs >> 35) & 31];

            charBuffer[6] = _encode32Chars[(int)(hs >> 30) & 31];

            charBuffer[7] = _encode32Chars[(int)(hs >> 25) & 31];

            charBuffer[8] = _encode32Chars[(int)(hs >> 20) & 31];

            charBuffer[9] = _encode32Chars[(int)(hs >> 15) & 31];

            charBuffer[10] = _encode32Chars[(int)(hs >> 10) & 31];

            charBuffer[11] = _encode32Chars[(int)(hs >> 5) & 31];

            charBuffer[12] = _encode32Chars[(int)hs & 31];

​

            charBuffer[13] = _encode32Chars[(int)(ls >> 60) & 31];

            charBuffer[14] = _encode32Chars[(int)(ls >> 55) & 31];

            charBuffer[15] = _encode32Chars[(int)(ls >> 50) & 31];

            charBuffer[16] = _encode32Chars[(int)(ls >> 45) & 31];

            charBuffer[17] = _encode32Chars[(int)(ls >> 40) & 31];

            charBuffer[18] = _encode32Chars[(int)(ls >> 35) & 31];

            charBuffer[19] = _encode32Chars[(int)(ls >> 30) & 31];

            charBuffer[20] = _encode32Chars[(int)(ls >> 25) & 31];

            charBuffer[21] = _encode32Chars[(int)(ls >> 20) & 31];

            charBuffer[22] = _encode32Chars[(int)(ls >> 15) & 31];

            charBuffer[23] = _encode32Chars[(int)(ls >> 10) & 31];

            charBuffer[24] = _encode32Chars[(int)(ls >> 5) & 31];

            charBuffer[25] = _encode32Chars[(int)ls & 31];

​

            return new string(charBuffer);

        }

    }