java常用时间类(LocalDateTime 转 字符串，指定日期格式；Date 转 字符串, 指定日期格式；Date 转 字符串，默认日期格式；timestamp 转 字符串，默认日期格式；

package net.xdclass.util;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;

public class TimeUtil {

    
    private static final String DEFAULT_PATTERN = "yyyy-MM-dd HH:mm:ss";

    
    private static final DateTimeFormatter DEFAULT_DATE_TIME_FORMATTER  = DateTimeFormatter.ofPattern(DEFAULT_PATTERN);

    private static final ZoneId DEFAULT_ZONE_ID = ZoneId.systemDefault();


    
    public static String format(LocalDateTime localDateTime, String pattern){
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        String timeStr = formatter.format(localDateTime.atZone(DEFAULT_ZONE_ID));
        return timeStr;
    }


    
    public static String format(Date time, String pattern){
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
        String timeStr = formatter.format(time.toInstant().atZone(DEFAULT_ZONE_ID));
        return timeStr;
    }

    
    public static String format(Date time){

        String timeStr = DEFAULT_DATE_TIME_FORMATTER.format(time.toInstant().atZone(DEFAULT_ZONE_ID));
        return timeStr;
    }

    
    public static String format(long timestamp) {
        String timeStr = DEFAULT_DATE_TIME_FORMATTER.format(new Date(timestamp).toInstant().atZone(DEFAULT_ZONE_ID));
        return timeStr;
    }


    
    public static Date strToDate(String time) {
        LocalDateTime localDateTime = LocalDateTime.parse(time, DEFAULT_DATE_TIME_FORMATTER);
        return Date.from(localDateTime.atZone(DEFAULT_ZONE_ID).toInstant());

    }


    
    public static Integer getRemainSecondsOneDay(Date currentDate) {
        LocalDateTime midnight = LocalDateTime.ofInstant(currentDate.toInstant(),
                ZoneId.systemDefault()).plusDays(1).withHour(0).withMinute(0)
                .withSecond(0).withNano(0);

        LocalDateTime currentDateTime = LocalDateTime.ofInstant(currentDate.toInstant(),
                ZoneId.systemDefault());
        long seconds = ChronoUnit.SECONDS.between(currentDateTime, midnight);
        return (int) seconds;
    }
}