repair_backend/src/main/java/com/repair/common/utils/DateUtils.java

package com.repair.common.utils;

import java.text.SimpleDateFormat;
import java.time.Duration;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Date;

public class DateUtils {

    //    计算时差
    public static String difference(Date start, Date end) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String time1 = sdf.format(start);
        String time2 = sdf.format(end);

        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime dateTime1 = LocalDateTime.parse(time1, formatter);
        LocalDateTime dateTime2 = LocalDateTime.parse(time2, formatter);
        Duration duration = Duration.between(dateTime1, dateTime2);

        long days = duration.toDays();
        long hours = duration.toHours() % 24;
        long minutes = duration.toMinutes() % 60;
        long seconds = duration.getSeconds() % 60;
//       System.out.println("时间差为：" + days + "天 " + hours + "小时 " + minutes + "分钟 " + seconds + "秒");
        return days + "天 " + hours + "小时 " + minutes + "分钟 " + seconds + "秒";
    }




    public static String startTime(Integer state) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        LocalDateTime now = LocalDateTime.now();

        switch (state) {
//           本年
            case 1:
                LocalDateTime localDateTime = now.minusYears(1);
                return localDateTime.format(dateTimeFormatter);
//           本月
            case 2:
                LocalDateTime localDateTime1 = now.minusMonths(1);
                return localDateTime1.format(dateTimeFormatter);

//            本周
            case 3:
                LocalDateTime localDateTime2 = now.minusWeeks(1);
                return localDateTime2.format(dateTimeFormatter);

//            今天
            case 4:
                LocalDateTime localDateTime3 = now.minusDays(1);
                return localDateTime3.format(dateTimeFormatter);
        }

        return null;
    }
    public static String endTime(){
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        return LocalDateTime.now().format(dateTimeFormatter);
    }

    public static String trendStartTime(Integer state){
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime now = LocalDateTime.now();
        now=now.withHour(0).withMinute(0).withSecond(0);
        switch (state) {
//           本年
            case 1:
                LocalDateTime localDateTime = now.withDayOfYear(1);
                return localDateTime.format(dateTimeFormatter);
//           本月
            case 2:
                LocalDateTime localDateTime1 = now.withDayOfMonth(1);
                return localDateTime1.format(dateTimeFormatter);

//            本周
            case 3:
                int value = now.getDayOfWeek().getValue();
                LocalDateTime localDateTime2 = now.minusDays(value-1);
                return localDateTime2.format(dateTimeFormatter);

//            今天
            case 4: ;
                return now.format(dateTimeFormatter);
        }

        return null;
    }

    /**
     *
     * @param state
     * @return
     */
    public static String trendComparisonStartTime(Integer state) {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime now = LocalDateTime.now();
        now=now.withHour(0).withMinute(0).withSecond(0);

        switch (state) {
//           去年
            case 1:
                LocalDateTime localDateTime = now.minusYears(1).withDayOfYear(1);
                return localDateTime.format(dateTimeFormatter);
//           上月
            case 2:
                LocalDateTime localDateTime1 = now.minusMonths(1).withDayOfMonth(1);

                return localDateTime1.format(dateTimeFormatter);

//            上周
            case 3:
                int value = now.getDayOfWeek().getValue();
                LocalDateTime localDateTime2 = now.minusWeeks(1).minusDays(value-1);
                return localDateTime2.format(dateTimeFormatter);

//            昨天
            case 4:
                LocalDateTime localDateTime3 = now.minusDays(1);
                return localDateTime3.format(dateTimeFormatter);
        }

        return null;
    }

    public static String weekName(int weekState){
        switch (weekState) {
            case 1:
                return "星期一";
            case 2:
                return "星期二";
            case 3:
                return "星期三";
            case 4:
                return "星期四";
            case 5:
                return "星期五";
            case 6:
                return "星期六";
            case 7:
                return "星期日";
        }
        return null;
    }

    public static void main(String[] args) {
        String s = trendStartTime(4);
        System.out.println("s = " + s);
        String s1 = trendComparisonStartTime(4);
        System.out.println("s1 = " + s1);
    }
}