Java 时间相关备忘

1.毫秒转换成日历格式

Long now = System.currentTimeMillis();
DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd 		hh:mm:ss");
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(now);
String show = formatter.format(calendar.getTime());

2.日历转换成毫秒

System.currentTimeMillis()

以后继续补充