Why does DateTimeFormatInfo.GetAllDateTimePatterns return different results in different .NET versions?
var culture = new CultureInfo("zh-CN", true);
var formats = culture.GetAllDateTimePatterns('D');

yyyy'年'M'月'd'日'
    yyyy'年'M'月'd'日',dddd
    dddd,yyyy'年'M'月'd'日'

yyyy'年'M'月'd'日'
   yyyy-MM-dd
   dddd, yyyy-MM-dd
   dddd, yyyy'年'M'月'd'日'