DateTime.ToString() display meridiem as "A.M." or "P.M."

Question

Is there any way to use the DateTime.ToString() method to display the meridiem of the time portion as "A.M." instead of "AM"? I tried using the mask "t.t." but this just outputs "A.A."

Answer 1

You can redefine the AMDesignator and PMDesignator properties of CultureInfo.DateTimeFormat, and then specify the culture as a format provider:

using System;
using System.Globalization;

class Program {
    public static void Main() {
        CultureInfo c = (CultureInfo)CultureInfo.CurrentCulture.Clone();
        c.DateTimeFormat.AMDesignator = "A.M.";
        c.DateTimeFormat.PMDesignator = "P.M.";
        Console.WriteLine(DateTime.Now.ToString("tt",c));
    }
}