Use an explicit culture and format string for stable text.

Formatting Dates

FormattingDates.cs
using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        string format = ;
        DateTime date = new DateTime(2026, 7, 4);
        CultureInfo culture = CultureInfo.GetCultureInfo("en-US");
        string formatted = date.ToString(format, culture);

        Console.WriteLine($"format={format}");
        Console.WriteLine($"formatted={formatted}");
    }
}
using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        string format = ;
        DateTime date = new DateTime(2026, 7, 4);
        CultureInfo culture = CultureInfo.GetCultureInfo("en-US");
        string formatted = date.ToString(format, culture);

        Console.WriteLine($"format={format}");
        Console.WriteLine($"formatted={formatted}");
    }
}
using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        string format = ;
        DateTime date = new DateTime(2026, 7, 4);
        CultureInfo culture = CultureInfo.GetCultureInfo("en-US");
        string formatted = date.ToString(format, culture);

        Console.WriteLine($"format={format}");
        Console.WriteLine($"formatted={formatted}");
    }
}
formatting Date format strings make output predictable for readers and programs.