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Getting issue when convert c# code to PHP as below

I am running this code:
var timeStamp = DateTime.UtcNow;
var sharedSecret = "xx";
var saltedString = timeStamp.ToString("2021-01-07T16:42:33.619667Z") + sharedSecret;
//Encoding saltedString using Unicode little-endian byte order
byte[] encodedSaltedString = Encoding.Unicode.GetBytes(saltedString);
//Hashing Algorithm used is SHA512
HashAlgorithm hash = new SHA512Managed();
//Compute Hash of encodedSaltedString
byte[] hashedEncodedString = hash.ComputeHash(encodedSaltedString);
//Convert hashed array to base64-encoded string
string signature = Convert.ToBase64String(hashedEncodedString);
I am then getting this result in C#:
"gQhjrLnY6fo44EeaaWaUBE1PY/8oEIRsUcK3AMSCVUCYMM4vRfxvQEEggXaHTF0GQbw4w2HbWArX1k6NnkzJFg=="
I converted to this code as below, but I am getting an issue. Can I get some help on this?
$timestamp = "2021-01-07T16:42:33.619667Z";
$sharedSecret = 'xx';
$saltedString = $timestamp.$sharedSecret;
$utf=mb_convert_encoding($saltedString, "UTF-16LE");
$signature = base64_encode(hash('sha512', $utf));
IN PHP I am getting this result:
ODEwODYzYWNiOWQ4ZTlmYTM4ZTA0NzlhNjk2Njk0MDQ0ZDRmNjNmZjI4MTA4NDZjNTFjMmI3MDBjNDgyNTU0MDk4MzBjZTJmNDVmYzZmNDA0MTIwODE3Njg3NGM1ZDA2NDFiYzM4YzM2MWRiNTgwYWQ3ZDY0ZThkOWU0Y2M5MTY=
But both should be same. The c# one is correct, I want the same in the php code as well.

From the PHP docs for hash:
hash ( string $algo , string $data , bool $binary = false ) : string|false
binary
   When set to true, outputs raw binary data. false outputs lowercase hexits.
You're not passing a value for $binary, so it's returning a string of hexadecimal characters.
The C# HashAlgorithm.ComputeHash method on the other hand binary data.
Since you're base64-encoding the result, you're presumably expecting the hash function to return binary data. You therefore need to pass true as the value for $binary:
$signature = base64_encode(hash('sha512', $utf, true));

C# SHA256 Hashing

Below is the code I use for hashing and I am trying to store the hash in a string(strSHA256) with UTF-8 encoding.
using (SHA256 sha256Hash = SHA256.Create())
{
bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(utf8EncodedString));
strSHA256 = Encoding.UTF8.GetString(bytes);
}
When I inspect the string variable I see "�u��Ou\u0004����O��zA�\u0002��\0�\a�}\u0012�L�Dr�"
type of value. My question is regarding to ? character marked in bold. They should be UTF-8 chars.
Why cant I view the UTF-8 special chars when I inspect from visual studio. The string o/p contains this weird char as well.
Note: I tried SHA256 with Node Js and I tend to see perfect UTF-8 special chars.

As #user2864740 mentioned bytes are not UTF8. Use base64 for bytes string representation.
var hello = "Hello world!";
using (var sha256Hash = SHA256.Create())
{
var bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(hello));
// String representation
var stringForBytes = Convert.ToBase64String(bytes);
// HEX string representation
var str = new StringBuilder(bytes.Length * 2);
foreach (var b in bytes)
{
str.Append(b.ToString("X2"));
}
var hexString = str.ToString();
}

How to convert php's mb_convert_encoding() to C# equivalent

I have tried rather unsuccessfully , to convert the following php code to C#
and require help please.
php code is
$string="012014Te$ting#501834502014060007400";
$salt = "Cli3ntH#sah";
$utfString=mb_convert_encoding($string.$salt,ÄSCII");
$hashTag=sha1($utfString,true);
$Hash = base64_encode($hashTag);
with C# code
byte[] ascii = Encoding.ASCII.GetBytes(objtohash);
byte[] utf8 = Encoding.Convert(Encoding.ASCII, Encoding.UTF8, ascii);
byte[] hashBytes2 = sha1.ComputeHash(utf8);
var Hash = Convert.ToBase64String(hashBytes2);
also tried this, where objtohash = $string.$salt (i.e. concatenated)
var sha1 = new System.Security.Cryptography.SHA1Managed();
//convert to ascii byte array
byte[] AScii = EncodeAscii(objtohash);
//Hash it
byte[] hashBytes = sha1.ComputeHash(AScii);
//convert it to base 64
var Hash = Convert.ToBase64String(hashBytes);
I have tried several other ways as per SO, but I cannot get the same hashed value as the php sample.Hopefully someone can do it and hopefully give explanation as to why.
Thanks

The syntax error was finger trouble.
The answer it turns out, ..basically by trying any and all combinations of what i could find by googling is:
var objtohashArry = Encoding.ASCII.GetBytes(objtohash);
var HashSharresult = SHA1.Create().ComputeHash(objtohashArry);
var requestHash = Convert.ToBase64String(HashSharresult);
RequestHash = requestHash;

Convert C# to Ruby - MD5 and Base 64 a String

I have this code that I need to convert to ruby, this snippet is to create a security key used for a particular API. The string that I am encrypting is a JSON object.
Should I use Digest::MD5.hexdigest() or Digest::MD5.digest()?
C# Code
string strResponse = "[{\"Key\":\"BookNumber\", \"Value\"=>\"BJAK123\"},{\"Key\"=>\"AuthorCode\", \"Value\"=>\"BNA123\"}]";
using (MD5 md5 = MD5.Create())
{
byte[] bPayload = Encoding.UTF8.GetBytes(strPayload);
byte[] bPayloadHash = md5.ComputeHash(bPayload);
strPayloadBase64 = Convert.ToBase64String(bPayloadHash);
}
Ruby Code
payload = [{"Key"=>"BookNumber", "Value"=>"BJAK123"},{"Key"=>"AuthorCode", "Value"=>"BNA123"}]
utf8_params = payload.to_json.force_encoding("iso-8859-1").force_encoding("utf-8")
payload_base64 = Base64.encode64(Digest::MD5.hexdigest(utf8_params))

Use
payload_base64 = Digest::MD5.base64digest(utf8_params)
as Digest::MD5.hexdigest produces a hex string of digest, whereas C# code is performing base64 encoding of the digest.

PHP MD5 not matching C# MD5

I have a hashing method in C# that looks like:
MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
byte[] raw_input = Encoding.UTF32.GetBytes("hello");
byte[] raw_output = md5.ComputeHash(raw_input);
string output = "";
foreach (byte myByte in raw_output)
output += myByte.ToString("X2");
return output;
How can I implement this in PHP? Doing the following produces a different hash digest...
$output = hash('md5', 'hello');

PHP
This PHP code will do:
<?php
$str = "admin";
$strUtf32 = mb_convert_encoding($str, "UTF-32LE");
echo md5($strUtf32);
?>
This code outputs "1e3fcd02b1547f847cb7fc3add4484a5"

You need to find out which encoding PHP is using to convert your string to text. It's very unlikely that it's using UTF-32. It may well be using the platform default encoding, or possibly UTF-8.
using (MD5 md5 = MD5.Create())
{
byte[] input = Encoding.UTF8.GetBytes("hello");
byte[] hash = md5.ComputeHash(input);
return BitConverter.ToString(hash).Replace("-", "");
}
(This is the problem with languages/platforms which treat strings as binary data all over the place - it doesn't make it clear what's going on. There has to be a conversion to bytes here, as MD5 is defined for bytes, not Unicode characters. In the C# code you're doing it explicitly... in the PHP it's implicit and poorly documented.)
EDIT: If you've got to change the PHP, you could try this:
$text = mb_convert_encoding($text, "UTF-32LE");
$output = md5($text)
It depends whether PHP supports UTF-32 though...

When you apply md5 to Encoding.UTF32.GetBytes("admin");, that's same as
echo hash( "md5","a\0\0\0d\0\0\0m\0\0\0i\0\0\0n\0\0\0");
//1e3fcd02b1547f847cb7fc3add4484a5
In php.
You need to convert your string to UTF32-LE in PHP:
echo md5( mb_convert_encoding( "admin", "UTF-32LE" ) );
//1e3fcd02b1547f847cb7fc3add4484a5