时间格式化转换及时间比较compareTo

package com.example.core.mydemo.date;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class DateTime2Test {

    public static final DateTimeFormatter DF2 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
    public static final DateTimeFormatter DF22 = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");

    public static void main(String[] args) {
        String ss = "2023-11-26 21:00:15";
        System.out.println("ss=" + ss);

        ss = "2023-11-26 21:00";

        /**
         * 时间格式的转换：在具体报错的地方做转换，可能不能从根本上面解决问题。不排除在其他的代码位置也会使用该错误格式的数据。
         *
         * 1.可以将数据源的数据批量格式化 yyyy-MM-dd
         * update tbl_test set ext1 = left(ext1,10) where RIGHT(`ext1`,8)  = '00:00:00' and `create_date` >= '2022-10-01 00:00:00'
         *
         * ## 没有数据需要二次处理
         * select * from tbl_test where RIGHT(`ext1`,8)  = '00:00:00' and `create_date` >= '2022-10-01 00:00:00'
         *
         * 2.从源头接口入参的方法处 做错误格式的参数 做兼容处理。
         */
        if(ss.length() == 16){
            ss = ss + ":00";
        }
        LocalDateTime rentDateTime = LocalDateTime.parse(ss, DF2);
        System.out.println("rentDateTime=" + rentDateTime);


        DateTimeFormatter YYYYMMDD_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd");
        String dateTimeStr = LocalDate.now().format(YYYYMMDD_FORMATTER);
        StringBuffer buffer = new StringBuffer(dateTimeStr);
        buffer.append("080000");
        Long dateTime = Long.valueOf(buffer.toString());
        System.out.println("dateTime=" + dateTime);

//        Long revertTime = 20231130140000L;
        Long revertTime = 20231204080000L;

        //compareTo  大于 = 1
        //compareTo  小于 = -1
        //compareTo  等于 = 0
        System.out.println("compareTo = " + dateTime.compareTo(revertTime));

        //找出revertTime大于当前时间的，标识为“符合”
        if (dateTime.compareTo(revertTime) == 1 || dateTime.compareTo(revertTime) == 0) {
            System.out.println("不符合");
        }else{
            System.out.println("符合");
        }

    }
}