自己梳理的LocalDateTime的工具类

参考链接地址：https://mp.weixin.qq.com/s/0HpT1N7eqzVhK0urLUAKlg

package com.example.localdate;

import java.time.Clock;
import java.time.Instant;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.Month;
import java.time.MonthDay;
import java.time.Period;
import java.time.Year;
import java.time.YearMonth;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;

public class DateUtils {
    

    public static void main(String[] args) {
    
        //获取当前年月日
        LocalDate localDate = getNow();
        System.out.println(localDate.toString());
        System.out.println(localDate.getYear());
        System.out.println(localDate.getMonthValue());
        System.out.println(localDate.getDayOfMonth());
        System.out.println(localDate.getDayOfWeek().getValue());

        //获取指定年月日
        LocalDate localDate1 = getLocalDate(2022, 7, 24);
        System.out.println(localDate1.toString());
        System.out.println(localDate1.getYear());
        System.out.println(localDate1.getMonthValue());
        System.out.println(localDate1.getDayOfMonth());
        System.out.println(localDate1.getDayOfWeek().getValue());

        //判断日期是否相同
        System.out.println(equalsLocalDate(localDate, localDate1));

    }

    //获取当前年月日
    public static LocalDate getNow(){
    
        LocalDate now = LocalDate.now();
        return now;
    }

    public static LocalDate getLocalDate(int year, int month, int day){
    
        LocalDate localDate = LocalDate.of(year, month, day);
        return localDate;
    }
	//判断年月日是否相同
    public static boolean equalsLocalDate(LocalDate date1, LocalDate date2){
    
        return date1.equals(date2);
    }
	//判断月日是否相同，可用于校验是否是生日
    public static boolean equalsMonthDay(LocalDate date){
    
        LocalDate now = LocalDate.now();
        MonthDay monthDay = MonthDay.of(date.getMonth(), date.getDayOfMonth());
        MonthDay currentMonthDay = MonthDay.from(now);
        return currentMonthDay.equals(monthDay);
    }

    //获取当前年月日时分秒
    public static LocalTime getNowTime(){
    
        LocalTime now = LocalTime.now();
        return now;
    }

    public static LocalTime addHours(int hours){
    
        return addHours(getNowTime(), hours);
    }

    public static LocalTime addHours(LocalTime localTime, int hours){
    
        return localTime.plusHours(hours);
    }

    public static LocalTime addMinutes(int minutes){
    
        return addMinutes(getNowTime(), minutes);
    }

    public static LocalTime addMinutes(LocalTime localTime, int minutes){
    
        return localTime.plusMinutes(minutes);
    }

    public static LocalTime addSeconds(int seconds){
    
        return addSeconds(getNowTime(), seconds);
    }

    public static LocalTime addSeconds(LocalTime localTime, int seconds){
    
        return localTime.plusSeconds(seconds);
    }

    public static LocalDate addWeek(int week){
    
        return addWeek(getNow(), week);
    }

    public static LocalDate addWeek(LocalDate localDate, int week){
    
        return localDate.plus(week, ChronoUnit.WEEKS);
    }

    public static LocalDate addYear(int year){
    
        return addYear(getNow(), year);
    }

    public static LocalDate addYear(LocalDate localDate, int year){
    
        return localDate.plus(year, ChronoUnit.YEARS);
    }

    public static LocalTime subHours(int hours){
    
        return addHours(getNowTime(), hours);
    }

    public static LocalTime subHours(LocalTime localTime, int hours){
    
        return localTime.minusHours(hours);
    }

    public static LocalTime subMinutes(int minutes){
    
        return subMinutes(getNowTime(), minutes);
    }

    public static LocalTime subMinutes(LocalTime localTime, int minutes){
    
        return localTime.minusMinutes(minutes);
    }

    public static LocalTime subSeconds(int seconds){
    
        return subSeconds(getNowTime(), seconds);
    }

    public static LocalTime subSeconds(LocalTime localTime, int seconds){
    
        return localTime.minusSeconds(seconds);
    }

    public static LocalDate subWeek(int week){
    
        return subWeek(getNow(), week);
    }

    public static LocalDate subWeek(LocalDate localDate, int week){
    
        return localDate.minus(week, ChronoUnit.WEEKS);
    }
	//减n年
    public static LocalDate subYear(int year){
    
        return subYear(getNow(), year);
    }
	//减n年
    public static LocalDate subYear(LocalDate localDate, int year){
    
        return localDate.minus(year, ChronoUnit.YEARS);
    }
	//获取时间戳
    public static long getNowTimeStamp() {
    
        // 1、
        // Returns the current time based on your system clock and set to UTC.
        // Clock clock = Clock.systemUTC();
        // System.out.println("Clock : " + clock.millis());

        // 2、
        // Returns time based on system clock zone
        // Clock defaultClock = Clock.systemDefaultZone();
        // defaultClock.millis();

        // 3、
        // 你也可以使用Date类和Instant类各自的转换方法互相转换，
        // 例如：Date.from(Instant) 将Instant转换成java.util.Date，
        // Date.toInstant()则是将Date类转换成Instant类。
        Instant timestamp = Instant.now();
        long l = timestamp.toEpochMilli();
        return l;
    }
	//上海时区的时间
    public static ZonedDateTime getLocalDateTimeByShanghai() {
    
        // Date and time with timezone in Java 8
        ZoneId america = ZoneId.of("Asia/Shanghai");
        LocalDateTime localtDateAndTime = LocalDateTime.now();
        ZonedDateTime dateAndTimeInShanghai  = ZonedDateTime.of(localtDateAndTime, america );
        return dateAndTimeInShanghai;
    }
	//这一个月有多少天
    public static int getLengthOfMonth(int year, int month) {
    
        YearMonth yearMonth = YearMonth.of(year, month);
        return yearMonth.lengthOfMonth();
    }
	//这一年有多少天
    public static int getLengthOfYear(int year) {
    
        Year year1 = Year.of(year);
        return year1.length();
    }
	//是否闰年
    public static boolean isLeapYear(int year) {
    
        Year year1 = Year.of(year);
        return year1.isLeap();
    }

    public static int gapMonths(LocalDate date1, LocalDate date2){
    
        Period periodToNextJavaRelease = Period.between(date1, date2);
        return periodToNextJavaRelease.getMonths();
    }

    public static int gapDays(LocalDate date1, LocalDate date2){
    
        Period periodToNextJavaRelease = Period.between(date1, date2);
        return periodToNextJavaRelease.getDays();
    }

    public static Date localDate2Date(LocalDate date){
    
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = date.atStartOfDay().atZone(zone).toInstant();
        java.util.Date da = Date.from(instant);
        return da;
    }

    public static LocalDate date2LocalDate(java.util.Date date){
    
        Instant instant = date.toInstant();
        ZoneId zone = ZoneId.systemDefault();
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
        LocalDate localDate= localDateTime.toLocalDate();
        return localDate;
    }

    public static Date localDateTime2Date(LocalDateTime date){
    
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = date.atZone(zone).toInstant();
        java.util.Date da = Date.from(instant);
        return da;
    }

    public static LocalDateTime date2LocalDateTime(java.util.Date date){
    
        Instant instant = date.toInstant();
        ZoneId zone = ZoneId.systemDefault();
        LocalDateTime localDateTime = LocalDateTime.ofInstant(instant, zone);
        return localDateTime;
    }

    public static LocalDate format2LocalDate(String dayAfterTommorrow) {
    
        //eg: String dayAfterTommorrow = "20180205";
        LocalDate formatted = LocalDate.parse(dayAfterTommorrow,
                DateTimeFormatter.BASIC_ISO_DATE);
        return formatted;
    }

    public static void formatExample() {
    
        LocalDateTime date = LocalDateTime.now();

        DateTimeFormatter format1 = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
        //日期转字符串
        String str = date.format(format1);

        System.out.println("日期转换为字符串:"+str);

        DateTimeFormatter format2 = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss");
        //字符串转日期
        LocalDate date2 = LocalDate.parse(str,format2);
        System.out.println("日期类型:"+date2);
    }

}