Castle DictionaryAdapter的字符串格式

我正在使用Castle DictionaryAdapter,以便从 App.CONFIG 作为接口(基于 Getting rid of strings (3): take your app settings to the next level ):

public interface ISettings {
  int MaxUsers { get; }
  string FeedbackMail { get; }
  DateTime LastUserLogin { get; }
}

App.CONFIG

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <appSettings>
    <add key="MaxUsers" value="20"/>
    <add key="FeedbackMail" value="foo@localhost"/>
    <add key="LastUserLogin" value="2009-06-15T13:45:30.0900000"/>
  </appSettings>
</configuration>

是否可以将DictionaryAdapter配置为使用自定义字符串格式,如 “YYYYMMD HDHMM” 用于转换存储在 App.CONFIG ?