Java Webservice和.NET客户端删除DateTime对象

Calendar calendar = Calendar.getInstance();
calendar.setTime(dateTime);
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
calendar.set(Calendar.MILLISECOND, 0);
Date dateWithoutTime = calendar.getTime();

DateTime dateTime = DateTime.Now;
DateTime dateWithoutTime = new DateTime(dateTime.Year, dateTime.Month, dateTime.Day);