If you run the following code: https://dotnetfiddle.net/kBqe9x
using System;
public class Program
{
public static void Main()
{
var date = DateTime.Now;
Console.WriteLine(date.ToString("yyyy/MM/dd", System.Globalization.CultureInfo.GetCultureInfo("ko-KR")));
}
}
The result will be 2022-01-18.
Why is .net replacing the forward-slash with a dash?
The forward slash is a special character, in DateTime you have to write that like '/'
using System;
public class Program
{
public static void Main()
{
var date = DateTime.Now;
Console.WriteLine(date.ToString("yyyy'/'MM'/'dd", System.Globalization.CultureInfo.GetCultureInfo("ko-KR")));
}
}
That's because ko-KR culture info has such a date pattern for a short date. If you take a look at the ShortDatePattern property of the CultureInfo you've created here, you'll see the following.
var cultureInfo = System.Globalization.CultureInfo.GetCultureInfo("ko-KR");
Console.WriteLine(cultureInfo.DateTimeFormat.ShortDatePattern);
This prints out: yyyy-MM-dd
Fiddle: https://dotnetfiddle.net/CRxKtQ
If you want to keep the pattern you specified in ToString method, simply remove the culture info.