Calendar a=new GregorianCalendar();
System.out.println(a.getTime());
a.add(Calendar.HOUR,2);
System.out.println(a.getTime());
得到HOUR
再加2 如上面
System.out.println(a.getTime());
a.add(Calendar.HOUR,2);
System.out.println(a.getTime());
得到HOUR
再加2 如上面
select dateadd(day,2, getdate())