有问题的代码如下: public static string ChangePersianDate(DateTime dateTime) { System.Globalization.GregorianCalendar PC = new System.Globalization.GregorianCalendar(); PC.CalendarType = System.Globalization.GregorianCalendarTypes.USEnglish; return PC.GetYear(dateTime).ToString() + "/" + PC.GetMonth(dateTime).ToString() + "/" + PC.GetDayOfMonth(dateTime).ToString() + "" + PC.GetHour(dateTime).ToString() + ":" + PC.GetMinute(dateTime).ToString() + ":" + PC.GetSecond(dateTime).ToString() + " " ???????????????? } 我怎样才能从dateTime值获得上午/下午?