java8 Date相关工具

自己整理的java8 常用的工具类

 /**
  * @Author taozhaoyang
  * @Description 结合 java8 线程安全
  * @Date 9:55 2018/7/30
  **/
 public class NewDateUtil {

     private static DateTimeFormatter sdf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

     /**
      * 时间戳 转 date(String)
      *
      * @param time 毫秒
      * @return
      */
     public static String formatTimestamp(Long time) {
         return sdf.format(LocalDateTime.ofInstant(Instant.ofEpochMilli(time), ZoneId.systemDefault()));
     }

     /**
      * @Author taozhaoyang
      * @Description  localDateTime 转 Date
      * @Date 20:07 2018/7/30
      * @Param [localDateTime]
      * @return java.util.Date
      **/
     public static Date  covertLocalDateTimeToDate (LocalDateTime localDateTime) {
         return  Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
     }

     /**
      * @Author taozhaoyang
      * @Description localDateTime 转 String
      * @Date 20:07 2018/7/30
      * @Param [localDateTime]
      * @return java.lang.String
      **/
     public static String  formatLocalDateTime (LocalDateTime localDateTime) {
         return formatDate(covertLocalDateTimeToDate(localDateTime));
     }

     /**
      * 时间 转 date(String)
      *
      * @param date
      * @return
      */
     public static String formatDate(Date date) {
         return sdf.format(covertDateToLocalDateTime(date));
     }

     public static LocalDateTime  covertDateToLocalDateTime (Date date) {
         return  LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());
     }
     /**
      * string 转date
      *
      * @param date
      * @return
      */
     public static Date parseString(String date) {
         return Date.from(LocalDateTime.parse(date, sdf).atZone(ZoneId.systemDefault()).toInstant());
     }

     /**
      * @Author taozhaoyang
      * @Description 比较相差多少天，只比较天数
      * @Date 20:30 2018/7/30
      * @Param [startDate, endDate]
      * @return long
      **/
     public static long compareDates(Date startDate,Date endDate) {
         return covertDateToLocalDateTime(endDate).toLocalDate().until(covertDateToLocalDateTime(endDate).toLocalDate(), ChronoUnit.DAYS);
     }

     /**
      * @Author taozhaoyang
      * @Description 今天 还剩多少秒
      * @Date 20:35 2018/7/30
      * @Param [startDate, endDate]
      * @return long
      **/
     public static long remianSecondsOfToday() {
         return LocalDateTime.now().until(LocalDateTime.of(LocalDate.now(),LocalTime.MAX), ChronoUnit.SECONDS);
     }

     /**
      * @Author taozhaoyang
      * @Description 和当前相差多少天
      * @Date 20:31 2018/7/30
      * @Param [endDate]
      * @return long
      **/
     public static long compareToDay(Date endDate) {
         return LocalDate.now().until(covertDateToLocalDateTime(endDate), ChronoUnit.DAYS);
     }

     public static void main(String[] args) {
         System.out.println("----------------------");
         long time = 1532353895000L;
         System.out.println(formatTimestamp(time));

         Date date = new Date();
         System.out.println(formatDate(date));

         String str = "2018-07-23 21:51:35";
         System.out.println(parseString(str));
         System.out.println("----------------------");

         System.out.println(formatLocalDateTime(LocalDateTime.now()));

         System.out.println(compareToDay(parseString(str)));
         System.out.println(remianSecondsOfToday());
     }
 }