荆棘从死亡中来，死亡又包含着新生。
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yyyyMMddHHmmss 格式转为日期 

String datetime =  "20140212111012";
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
LocalDateTime ldt = LocalDateTime.parse(datetime,dtf);
System.out.println(ldt);//2014-02-12T11:10:12


DateTimeFormatter fa = DateTimeFormatter.ofPattern("yyyy-MM-dd HH🇲🇲ss");
String datetime2 = ldt.format(fa);
System.out.println(datetime2);//2014-02-12 11:10:12


Date date = new Date();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH🇲🇲ss");
//Date->DateString
String format = simpleDateFormat.format(date);
System.out.println(format);//2017-05-16 11:44:05
//DateString->Date
Date parse = simpleDateFormat.parse(format);
System.out.println(parse);//Thu May 16 11:44:05 CST 2017
//Date->long
long time = date.getTime();
System.out.println(time);//1557979623359
//long->DateString
String format1 = simpleDateFormat.format(new Date(Long.valueOf(time)));
System.out.println(format1);//2017-05-16 12:07:03

//得到年月日的时间戳:不包含时分秒
Date d = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
//SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH🇲🇲ss");
String format = sdf.format(d);
Date parse = sdf.parse(format);
long time = parse.getTime();
System.out.println(format);
System.out.println(time);
String s = "1566403200000";
String a = "1567395537000";
Long timeL = Long.valueOf(s);
Date date = new Date(timeL);
System.out.println(date);