jsl-questionnaire-base/src/main/java/com/qs/serve/common/util/DateUtils.java

package com.qs.serve.common.util;

import com.qs.serve.common.util.model.DateFormatString;
import lombok.experimental.UtilityClass;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;

/**
 * @author YenHex
 * @since 2022/3/1
 */
@UtilityClass
public class DateUtils {

    public static Date localDateToDate(LocalDate date){
        //LocalDate date = LocalDate.of(2006,07,26);
        ZoneId zone = ZoneId.systemDefault();
        Instant instant = date.atStartOfDay().atZone(zone).toInstant();
        java.util.Date da = Date.from(instant);
        return da;
    }

    public static String getString(DateFormatString format){
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format.getValue());
        return LocalDateTime.now().format(formatter);
    }


    public static LocalDate toLocalDate(Date date){
//        Instant instant = date.toInstant();
//        ZoneId zoneId = ZoneId.systemDefault();
//        return instant.atZone(zoneId).toLocalDate();
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String str = dateFormat.format(date);
        String[] a = str.split("-");
        return LocalDate.of(Integer.parseInt(a[0]),Integer.parseInt(a[1]),Integer.parseInt(a[2]));
    }

    public static Date toDate(LocalDate localDate){
        ZoneId zoneId = ZoneId.systemDefault();
        ZonedDateTime zdt = localDate.atStartOfDay(zoneId);
        return Date.from(zdt.toInstant());
    }

    /**
     * 获取设置后得时间
     * @param time
     * @param unit
     * @param num
     * @return
     */
    public static LocalDateTime beSetTime(LocalDateTime time, ChronoUnit unit,int num){
        if(num>0){
            return time.plus(num,unit);
        }else {
            return time.minus(-num,unit);
        }
    }

    public static LocalDate beSetDate(LocalDate time,int days){
        return time.plusDays(days);
    }

    public static Date toDate(String str,String format){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        try {
            return sdf.parse(str);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return null;
    }

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

    public static double diffTime(long beganTime, long endTime) {
        return (double)(endTime - beganTime) / 1000.0D;
    }

    public static String format(LocalDateTime localDateTime, DateFormatString format){
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format.getValue());
        return localDateTime.format(formatter);
    }

    public static String datePath(){
        return format(LocalDate.now(),DateFormatString.DATE);
    }

    public static String format(LocalDate localDate, DateFormatString format){
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern(format.getValue());
        return localDate.format(formatter);
    }

    public static void main(String[] args) {
        System.out.println(DateUtils.beSetTime(LocalDateTime.now(), ChronoUnit.DAYS,-2));
        // Get the LocalDateTime instance
        LocalDateTime ldt
                = LocalDateTime
                .parse("2019-12-31T19:15:30");

        // Get the String representation of this LocalDateTime
        System.out.println("Original LocalDateTime: "
                + ldt.toString());

        // subtract 200 DAYS to LocalDateTime
        LocalDateTime value
                = ldt.minus(200, ChronoUnit.DAYS);

        // print result
        System.out.println("LocalDateTime after subtracting DAYS: "
                + value);
    }

}