LocalDateTime
LocalDateTime 转 Date
LocalDateTime now = LocalDateTime.now();
Date localDateTime2Date = Date.from(now.atZone(ZoneId.systemDefault()).toInstant());
LocalDateTime 转 String
LocalDateTime now = LocalDateTime.now();
String localTime2String = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(now);
LocalDateTime 转 Long
Long time1 = LocalDateTime.now().toInstant(ZoneOffset.of("+8")).toEpochMilli();
Date
Date 转 LocalDateTime
Instant instant = new Date().toInstant();
ZoneId zoneId = ZoneId.systemDefault();
LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zoneId);
Date 转 String
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date2String = dateFormat.format(new Date());
Date 转 Long
long time3 = new Date().getTime();
String
String 转 LocalDateTime
DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime string2LocalDateTime = LocalDateTime.parse("2018-01-12 17:07:05", dateTimeFormatter);
String 转 Date
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date string2Date = dateFormat.parse("2018-10-20 20:18:11");
注意:获取毫秒数的其他方式
// 获取当前毫秒
Long time2 = System.currentTimeMillis();
// 更精确的纳米级时间值
Long time4 = System.nanoTime();
// ali 不推荐使用
long time3 = new Date().getTime();
