java8时间工具类

package com.test.test.utils;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjusters;
import java.util.Date;


public class LocalDateTimeUtils {

    
    public static final String DATE_FORMAT_NORMAL = "yyyy-MM-dd HH:mm:ss";
    public static final String DATE_FORMAT_NUMBER = "yyyyMMddHHmmss";
    public static final String DATE_FORMAT_T = "yyyy-MM-ddTHH:mm:ss";

    
    public static Date localDateTime2Date(LocalDateTime localDateTime) {
        return Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());
    }

    
    public static LocalDateTime date2LocalDateTime(Date date) {
        return date.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime();
    }

    
    public static String localDateTime2String(LocalDateTime localDateTime) {
        return localDateTime.format(DateTimeFormatter.ofPattern(DATE_FORMAT_NORMAL));
    }

    
    public static String localDateTime2String(LocalDateTime localDateTime, String datePattern) {
        return localDateTime.format(DateTimeFormatter.ofPattern(datePattern));
    }

    
    public static LocalDateTime string2LocalDateTime(String dateString, String datePattern) {
        return LocalDateTime.parse(dateString, DateTimeFormatter.ofPattern(datePattern));
    }

    
    public static long localDateTime2Timestamp(LocalDateTime localDateTime) {
        return localDateTime.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond();
    }

    
    public static LocalDateTime timestamp2LocalDateTime(long timestamp) {
        return LocalDateTime.ofInstant(Instant.ofEpochSecond(timestamp), ZoneId.systemDefault());
    }

    
    public static long localDateTime2TimeMillis(LocalDateTime localDateTime) {
        return localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
    }

    
    public static LocalDateTime timeMillis2LocalDateTime(long timeMillis) {
        return LocalDateTime.ofInstant(Instant.ofEpochMilli(timeMillis), ZoneId.systemDefault());
    }

    
    public static LocalDateTime getYearStart(LocalDateTime localDateTime) {
         return localDateTime.with(TemporalAdjusters.firstDayOfYear()).with(LocalTime.MIN);
    }

    
    public static LocalDateTime getYearStart(int offset) {
         return LocalDateTime.now().plusYears(offset).with(TemporalAdjusters.firstDayOfYear()).with(LocalTime.MIN);
    }

    
    public static LocalDateTime getYearEnd(LocalDateTime localDateTime) {
        return localDateTime.with(TemporalAdjusters.lastDayOfYear()).with(LocalTime.MAX);
    }

    
    public static LocalDateTime getYearEnd(int offset) {
        return LocalDateTime.now().plusYears(offset).with(TemporalAdjusters.lastDayOfYear()).with(LocalTime.MAX);
    }

    
    public static LocalDateTime getMonthStart(LocalDateTime localDateTime) {
        return localDateTime.with(TemporalAdjusters.firstDayOfMonth()).with(LocalTime.MIN);
    }

    
    public static LocalDateTime getMonthStart(int offset) {
        return LocalDateTime.now().plusMonths(offset).with(TemporalAdjusters.firstDayOfMonth()).with(LocalTime.MIN);
    }

    
    public static LocalDateTime getMonthEnd(LocalDateTime localDateTime) {
        return localDateTime.with(TemporalAdjusters.lastDayOfMonth()).with(LocalTime.MAX);
    }

    
    public static LocalDateTime getMonthEnd(int offset) {
        return LocalDateTime.now().plusMonths(offset).with(TemporalAdjusters.lastDayOfMonth()).with(LocalTime.MAX);
    }

    
    public static LocalDateTime getDayStart(LocalDateTime localDateTime) {
        return localDateTime.with(LocalTime.MIN);
    }

    
    public static LocalDateTime getDayStart(int offset) {
        return LocalDateTime.now().plusDays(offset).with(LocalTime.MIN);
    }

    
    public static LocalDateTime getDayEnd(LocalDateTime localDateTime) {
        return localDateTime.with(LocalTime.MAX);
    }

    
    public static LocalDateTime getDayEnd(int offset) {
        return LocalDateTime.now().plusDays(offset).with(LocalTime.MAX);
    }
}