LocalDateTime、LocalDate、Long、Date、String 相互转换 DateTimeFormatter dateTimeFormatter1 = DateTimeFormatter.ofPattern(“yyyy-MM-dd HH:mm:ss”); DateTimeFormatter dateTimeFormatter2 = DateTimeFormatter.ofPattern(“yyyy-MM-dd”);
LocalDateTime localDateTime = LocalDateTime.parse(“2019-07-31 00:00:00”,dateTimeFormatter1); LocalDate localDate = LocalDate.parse(“2019-07-31”,dateTimeFormatter2); Date date = Date.from(LocalDateTime.parse(“2019-07-31 00:00:00”,dateTimeFormatter1).atZone(ZoneId.systemDefault()).toInstant());
String strDateTime = “2019-07-31 00:00:00”; String strDate = “2019-07-31”; Long timestamp=1564502400000l;
/** LocalDateTime 转 LocalDate / System.out.println("LocalDateTime 转 LocalDate: "+localDateTime.toLocalDate()); /* LocalDateTime 转 Long / System.out.println("LocalDateTime 转 Long: "+localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()); /* LocalDateTime 转 Date / System.out.println("LocalDateTime 转 Date: "+Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant())); /* LocalDateTime 转 String */ System.out.println("LocalDateTime 转 String: "+localDateTime.format(dateTimeFormatter1));
System.out.println("-------------------------------");
/** LocalDate 转 LocalDateTime / System.out.println("LocalDate 转 LocalDateTime: "+LocalDateTime.of(localDate,LocalTime.parse(“00:00:00”))); /* LocalDate 转 Long / System.out.println("LocalDate 转 Long: "+localDate.atStartOfDay(ZoneId.systemDefault()).toInstant().toEpochMilli()); /* LocalDate 转 Date / System.out.println("LocalDate 转 Date: "+Date.from(localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant())); /* LocalDate 转 String */ System.out.println("LocalDateTime 转 String: "+localDateTime.format(dateTimeFormatter2));
System.out.println("-------------------------------");
/** Date 转 LocalDateTime / System.out.println("Date 转 LocalDateTime: "+LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault())); /* Date 转 Long / System.out.println("Date 转 Long: "+date.getTime()); /* Date 转 LocalDate / System.out.println("Date 转 LocalDateTime: "+LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault()).toLocalDate()); /* Date 转 String */ SimpleDateFormat sdf =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss SSS” ); System.out.println("Date 转 String: "+sdf.format(date));
System.out.println("-------------------------------");
/** String 转 LocalDateTime / System.out.println("String 转 LocalDateTime: "+LocalDateTime.parse(strDateTime,dateTimeFormatter1)); /* String 转 LocalDate / System.out.println("String 转 LocalDate: "+LocalDateTime.parse(strDateTime,dateTimeFormatter1).toLocalDate()); System.out.println("String 转 LocalDate: "+LocalDate.parse(strDate,dateTimeFormatter2)); /* String 转 Date */ System.out.println("String 转 Date: "+Date.from(LocalDateTime.parse(strDateTime,dateTimeFormatter1).atZone(ZoneId.systemDefault()).toInstant()));
System.out.println("-------------------------------");
/** Long 转 LocalDateTime / System.out.println(“Long 转 LocalDateTime:”+LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault())); /* Long 转 LocalDate */ System.out.println(“Long 转 LocalDate:”+LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault()).toLocalDate());
