DateTime.Tomorrow();

static DateTime Tomorrow(this Datetime value) { //... }

public static MyClass {
  public static Tomorrow() { //... }
}

static class DateTimeHelper
{
    public static DateTime Tomorrow
    {
    	get { return DateTime.Now.AddDays(1); }
    }
}

DateTime tomorrow = DateTimeHelper.Tomorrow;

namespace ExtensionMethods
{
    public static class MyExtensionMethods
    {
        public static DateTime Tomorrow(this DateTime date)
        {
            return date.AddDays(1);
        }
    }
}

DateTime.Now.Tomorrow();

or (any object of type DateTime).Tomorrow();

public static class Foo
{
    public static void Bar()
    {
        var now = DateTime.Now;
        var tomorrow = typeof(DateTime).Tomorrow();
    }

    public static DateTime Tomorrow(this System.Type type)
    {
        if (type == typeof(DateTime)) {
            return DateTime.Now.AddDays(1);
        } else {
            throw new InvalidOperationException();
        }
    }
}

public static class DateTimeUtils
{
    public static DateTime Tomorrow { get { ... } }
}

WriteLine("{0}", DateTimeUtils.Tomorrow)

DateTime.Tomorrow

DateTimeUtil.Tomorrow