如何在 ASP.NET 项目中设置全局 DateTime 格式？

public class DateTimeFormatProvider : IFormatProvider, ICustomFormatter
{
    public object GetFormat(Type formatType)
    {
        return formatType == typeof(ICustomFormatter) ? this : null;
    }

    public string Format(string format, object arg, IFormatProvider formatProvider)
    {
        if (arg is DateTime)
        {
            return ((DateTime)arg).ToString(format);
        }
        return null;
    }
}

protected void Application_BeginRequest(object sender, EventArgs e)
{
    CultureInfo culture = new CultureInfo(Thread.CurrentThread.CurrentCulture.Name);
    culture.DateTimeFormat.ShortDatePattern = "yyyy-MM-dd";
    culture.DateTimeFormat.LongDatePattern = "yyyy-MM-dd HH:mm:ss";
    Thread.CurrentThread.CurrentCulture = culture;
    Thread.CurrentThread.CurrentUICulture = culture;
}

DateTime dateTime = DateTime.Now;
string shortDate = String.Format(new DateTimeFormatProvider(), "{0:d}", dateTime);
string longDate = String.Format(new DateTimeFormatProvider(), "{0:D}", dateTime);