public static void ParseExact_String_String_FormatProvider_DateTimeStyles_CustomFormatProvider()
{
var formatter = new MyFormatter();
string dateBefore = DateTime.Now.ToString();
DateTimeOffset dateAfter = DateTimeOffset.ParseExact(dateBefore, "G", formatter, DateTimeStyles.AssumeUniversal);
Assert.Equal(dateBefore, dateAfter.DateTime.ToString());
}