1.Calendar 转化 String
//获取当前时间的具体情况,如年,月,日,week,date,分,秒等
Calendar calendat = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);
String date = sdf.format(calendar.getTime());
2.String 转化Calendar
String str=”2010-5-27″;
SimpleDateFormat sdf= new SimpleDateFormat(“yyyy-MM-dd”);
Date date =sdf.parse(str);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
3.Date 转化String
SimpleDateFormat sdf= new SimpleDateFormat(“yyyy-MM-dd”);
String dateStr=sdf.format(new Date());
4.String 转化Date
String str=”2010-5-27″;
SimpleDateFormat sdf= new SimpleDateFormat(“yyyy-MM-dd”);
Date birthday = sdf.parse(str);
5.Date 转化Calendar
Calendar calendar = Calendar.getInstance();
calendar.setTime(new java.util.Date());
6.Calendar转化Date
Calendar calendar = Calendar.getInstance();
java.util.Date date =calendar.getTime();
7.Calendar转long
long l = ca.getTimeInMillis();
ca.setTime(d);
ca.setTimeInMillis(l);
8、Calendar加减时间
calendar.setTime(date);//時間转calendar
calendar.add(Calendar.DAY_OF_MONTH, 1);//加减时间，前面：时分秒，后门是值，值可以为负数，就是减时间
