//輸入日期轉化爲毫秒數 ---用calendar方法(calendar.getTime)
Calendar calendar = Calendar.getInstance();
calendar.set(2018, 2, 15, 8, 31, 5);
System.out.println(calendar.getTimeInMillis());
//輸入日期,轉化爲毫秒數,用DATE方法()
/**
* 先用SimpleDateFormat.parse() 方法將日期字符串轉化爲Date格式
* 通過Date.getTime()方法,將其轉化爲毫秒數
*/
String date = "2001-03-15 15-37-05";
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss");//24小時制
// SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh-mm-ss");//12小時制
long time2 = simpleDateFormat.parse(date).getTime();
System.out.println(time2);
//輸入毫秒數,轉化爲日期,用simpleDateFormat + Date 方法;
/**
* 直接用SimpleDateFormat格式化 Date對象,即可得到相應格式的日期 字符串。
*/
long time3 = System.currentTimeMillis() + 5000 *1000;
Date date2 = new Date();
date2.setTime(time3);
System.out.println(simpleDateFormat.format(date2));
//輸入毫秒數,轉化爲日期,用calendar方法;
Calendar calendar2 = Calendar.getInstance();
calendar2.setTimeInMillis(time3);
int year = calendar2.get(Calendar.YEAR);
int month = calendar2.get(Calendar.MONTH);
int day = calendar2.get(Calendar.DAY_OF_MONTH);
int hour = calendar2.get(Calendar.HOUR_OF_DAY);//24小時制
// int hour = calendar2.get(Calendar.HOUR);//12小時制
int minute = calendar2.get(Calendar.MINUTE);
int second = calendar2.get(Calendar.SECOND);
System.out.println(year + "年" + (month + 1) + "月" + day + "日"
+ hour + "時" + minute + "分" + second + "秒");